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  • 151.
    Johansson, Emil
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Chacon, Cyril
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Zlotea, Claudia
    Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Andersson, Yvonne
    Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Hjörvarsson, Björgvin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics. Department of Physics and Materials Science, Physics III. Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hydrogen uptake and optical properties of sputtered Mg-Ni thin films2004In: Journal of Physics: Condensed Matter, Vol. 16, p. 7649-Article in journal (Refereed)
    Abstract [en]

    The hydrogen uptake and distribution in wedged Mg–Ni films, with composition ranging from Mg0.85Ni0.15 to Mg0.55Ni0.45, were investigated. Upon hydrogen loading at 298 K these films undergo a transition from a mirror-like metallic to a semiconducting transparent state. After exposure to a hydrogen pressure of 1 bar, the samples exhibit large variation in optical appearance, ranging from a pale yellowish (Mg rich side) to a brownish shade (Ni rich side). The change in the effective optical band gap Egeff as a function of sample composition and hydrogen concentration was determined; it showed changes from 3.6 eV in the Ni poor domain to 2.4 eV in the Ni rich domain. Composition analysis using the 15N nuclear resonance method showed close to homogeneous hydrogen distribution throughout the film and close to linear increase in the hydrogen uptake with increasing Mg content. The thermal stability of the films is limited; annealing above 393 K results in significant redistribution of the constituents. Mg is enriched at the surface, reacting with Pd and thereby degrading the capping layer through the formation of Mg6Pd and MgO, as determined by x-ray diffraction, x-ray photoelectron spectroscopy and Rutherford backscattering studies. This redistribution results in a severe decrease of the hydrogen uptake rate, as monitored by in situ resistivity measurements.

  • 152.
    Johansson, Erik M.J.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
    Edvinsson, Tomas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Odelius, M.
    Hagberg, Daniel P.
    KTH, Organisk kemi / Organic chemistry.
    Sun, Licheng
    KTH, Organisk kemi / Organic chemistry.
    Hagfeldt, Anders
    KTH, Fysikalisk kemi / Physical Chemistry.
    Siegbahn, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
    Rensmo, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
    Electronic and Molecular Surface Structure of a Polyene-diphenylaniline Dye Adsorbed from Solution onto Nanoporous TiO22007In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 111, no 24, p. 8580-8586Article in journal (Refereed)
    Abstract [en]

    The surface electronic and molecular structure of a new organic chromophore useful for dye-sensitized nanostructured solar cells has been investigated by means of electron spectroscopy. Initially the use of a simple molecular system containing the polyene-diphenylaniline chromophore in a solar cell device was verified. The electronic and molecular surface structure of the functional dye-sensitized interface was then investigated in detail by a combination of core level spectroscopy, valence level spectroscopy, X-ray absorption spectroscopy, and resonant photoemission spectroscopy. The results indicate a dominating orientation of the molecule at the surface, having the diphenylaniline moiety pointing out from the surface. Valence level spectroscopy, X-ray absorption spectroscopy, and resonant photoemission spectroscopy were used to experimentally delineate the frontier electronic structure of the molecule, and the experimental spectra were analyzed against theoretical spectra, based on density functional theory. Together the investigation gives insight into energy matching of the molecular electronic states with respect to the TiO2 substrate as well as the localization of the frontier electronic states and the direction of the charge-transfer absorption process with regards to the TiO2 surface.

  • 153. Johansson, Jan
    et al.
    Halthur, Tobias
    Herranen, Merja
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Polymer Chemistry. oorganisk kemi.
    Söderberg, Lennart
    Elofsson, Ulla
    Hilborn, Jöns
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Polymer Chemistry. polymerkemi.
    Build-up of Collagen and Hyaluronic Acid Polyelectrolyte Multilayers2005In: Biomacromolecules, Vol. 6, no 3, p. 1353-1359Article in journal (Refereed)
    Abstract [en]

    We have used a novel polyelectrolyte multilayer (PEM) coating consisting of the polyelectrolytes collagen and hyaluronic acid. The build-up by the layer-by-layer deposition technique is outlined by ex situ and in situ ellipsometric measurements. When collagen was added, the thickness of the PEM was increased, and the refractive index was decreased. Corresponding but opposite effects were noted when hyaluronic acid was added. These changes are considered to be explained by a diffusion mechanism. It was also found that the PEM layers were unstable at physiological pH. However, by cross-linking using N-(3-di-methylaminopropyl)-N'-ethylcarbodiimide together with N-hydroxysuccinimide, a stable PEM layer resulted. These tissue friendly PEM layers are expected to have a great impact in the design of artificial extracellular matrixes. Also, the insertion of fluorescence labels demonstrates the potential for incorporation of other functionalities.

  • 154. Johansson, M
    et al.
    Yousif, M. Y. A
    Lundgren, P
    Bengtsson, S
    Sundqvist, Jonas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Radamson, H.H
    HfO2 gate dielectrics on strained-Si and strained-Si Ge layers.2003In: Semicond Sci. Technol., no 18, p. 820-826Article in journal (Refereed)
  • 155.
    Kamali, Saeed
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Häggström, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
    Sahlberg, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Wäppling, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
    Magnetic and interface properties of Fe0.82Ni0.18/Co(001) superlattices2011In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 23, no 5, p. 055301-Article in journal (Refereed)
    Abstract [en]

    The thickness dependence of the Fe magnetic hyperfine field and the interfacial intermixing of Fe0.82Ni0.18/Co superlattices, with the same thickness for FeNi and Co layers, have been investigated. A local concentration model using the magnetic hyperfine field values from the [Fe0.82Ni0.18](1-x)Co-x alloys has been used to interpret the field distribution in the superlattices and the Co concentration profiles over the superlattices. A relationship between the Fe magnetic hyperfine field and the Fe magnetic moment has been determined for the unordered [Fe0.82Ni0.18](1-x)Co-x and Fe1-xCox alloys. The magnetic hyperfine fields have been explained using two Fermi contact terms: (i) the core electron term proportional to the Fe magnetic moment with a proportionality constant of -13 T/mu B and (ii) a valence electron term linearly dependent on the Co concentration. The direction of the magnetic moments is found to be in the sample plane except for the 1/1 superlattice, where an angle of about 45 degrees is found.

  • 156.
    Kamali-Moghaddam, Saeed
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Ericsson, Tore
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Häggström, Lennart
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
    Berger, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Ronneteg, Sabina
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Felton, Solveig
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    TlCu1.73Fe0.27Se2 studied by means of Mössbauer spectroscopy and SQUID magnetometry2006In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 18, no 31, p. 7373-7382Article in journal (Refereed)
    Abstract [en]

    TlCu2-xFexSe2 is a p-type metal for x < 0.5 which crystallizes in a body-centred tetragonal structure. The metal atoms are situated in ab-planes, similar to 7 angstrom apart, while the metal - metal distance within the plane is similar to 2.75 angstrom. Due to the large difference in cation distances, the solid solutions show magnetic properties of mainly two-dimensional character. The SQUID measurements performed for x = 0.27 give the c-axis as the easy axis of magnetization, but also show clear hysteresis effects at 10 K, indicating a partly ferromagnetic coupling. The magnetic ordering temperature T-c is 55( 5) K as found from both SQUID and Mossbauer spectra. At T << Tc the magnetic hyperfine fields are distributed with a maximum at about 30 T, which are compared to the measured magnetic moment per iron atom, which is 0.97 mu(B)/Fe as found from SQUID measurements. The experimental results are compared to results using other methods on isostructural Tl selenides.

  • 157.
    Karis, Olof
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Valizadeh, Sima
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry. Elektronmikroskopi.
    Surpi, Alessandro
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry. Istituto di Fotonica e Nanotecnologie (C.N.R.).
    HUNTER DUNN, J
    MAX-lab, Lund, Sweden..
    SVEDLINDH, PETER
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Stanciu, V
    Warnicke, P
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Sandell, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Nyholm, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Sanyal, Biplab
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Eriksson, Olle
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Materials Science, Experimental Physics. Chemistry, Department of Physical and Analytical Chemistry, Analytical Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Department of Materials Chemistry, Inorganic Chemistry.
    Electronic and geometric structure of (Zn,Co)O room temperature Ferromagnets2005In: 50th MMM Meeting Program, 2005Conference paper (Refereed)
  • 158.
    Karlsson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Adsorption of Growth Species on the c-BN(100) Surface2011In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 34, p. 16977-16983Article in journal (Refereed)
    Abstract [en]

    The cubic phase of boron nitride (c-BN) is an extremely promising multifunctional material. However, to exploit all possible applications, a successful route for large area chemical vapor deposition (CVD) of c-BN films is required. Adsorption of gaseous growth species onto the c-BN surface is one of the key elementary reactions in CVD growth of c-BN. In the present work, the ability of BH(x), BF(x), and NH(x) species (x = 0, 1, 2, 3) to act as growth species for CVD of c-BN, in an H-, F-, or H/F-saturated gas-phase, has been investigated using density functional theory (DFT) calculations. It was found that the most optimal growth species for CVD growth of c-BN are B, BH, BH(2), BF, BF(2), N, NH, and NH(2) in an H/F-saturated gas-phase, i.e., decomposition of the incoming BH(3), BF(3), and NH(3) growth species is very crucial for CVD growth of c-BN. It was also found that it would be most preferable to use a CVD method where the incoming BH(3), BF(3), and NH(3) growth species are separately introduced into the reactor, e.g., by using an atomic layer deposition (ALD) type of method.

  • 159.
    Karlsson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Halogen-Induced Reconstruction of the c-BN(100) Surface2011In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 46, p. 22910-22916Article in journal (Refereed)
    Abstract [en]

    The cubic phase of boron nitride (c-BN) is an extremely promising multifunctional material. However, to exploit all possible applications, large area chemical vapor deposition (CVD) of c-BN films is required. To be successful in the CVD growth of high-quality c-BN films, one must be able to stabilize the sp(3) hybridization of the surface atoms; and in the present study, the surface stabilizing effect of F and Cl on the B- and N-terminated c-BN(100)-(1 x 1) surfaces has been investigated using density functional theory (DFT) calculations. It was found that Cl, most probably, will induce large sterical hindrance on both the B- and N-terminated c-BN(100) surface. F, on the other hand, was found to be a promising surface stabilizing agent for the B- and N-terminated c-BN(100) surface. However, the F atoms must be abstracted with H atoms. It can therefore be concluded that the optimal gas-phase composition for growth of c-BN consists of a mixture of H and F.

  • 160.
    Karlsson, Johan
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hydrogen-Induced De/Reconstruction of the c-BN(100) Surface2010In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 8, p. 3516-3521Article in journal (Refereed)
    Abstract [en]

    The cubic phase of boron nitride (c-BN) is an extremely promising multifunctional material. However, to exploit all possible applications, large area chemical vapor deposition (CVD) of c-BN films is required. For a successful CVD growth of high-quality c-BN films one must obtain a deeper understanding about the structural and electronic properties of the dominant c-BN growth surfaces under CVD conditions, that is, the (100), (110), and (111) surfaces, and their modification in the presence of surface stabilizing atomic hydrogen (H). In the present study, the surface stabilizing effect of H on the B- and N-terminated (1 × 1), (2 × 1), (2 × 4), (2 × 4(3)), and c(2 × 2) surfaces of c-BN(100) has therefore been investigated using density functional theory (DFT) calculations. It was found that a 100% surface coverage of on-top H on the B-terminated c-BN(100) surfaces is not able to uphold an ideal bulk-like (1 × 1) structure. However, the H atoms were able to uphold a bulk-like bond angle and bond length for the surface B atoms on the 100% H-covered B-terminated c-BN(100)-(2 × 1) surface. For the N-terminated c-BN(100) surfaces opposite observations were made. The H atoms were found to chemisorb strongly to both the B-terminated c-BN(100)-(2 × 1) surface and the N-terminated c-BN(100)-(1 × 1) surface. The process of H abstraction, with gaseous atomic H, was found to be significantly more favorable for the B-terminated c-BN(100)-(2 × 1) surface than for the N-terminated c-BN(100)-(1 × 1) surface. It was also found that N radical sites are more stable toward radical surface site collapse than B radical sites.

  • 161.
    Karlsson, M.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Surface Biotechnology. Department of Materials Chemistry, Inorganic Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Physical and Analytical Chemistry.
    Johansson, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Tang, L.
    Boman, Mats
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Nanoporous aluminum oxide affects neutrophil behaviour2004In: Microscopy Research and Technique, Vol. 63, no 5, p. 259-265Article in journal (Refereed)
    Abstract [en]

    This study evaluates neutrophil responses on aluminum oxide membranes. Using an in vitro cell culture system, we have found that the pore size (20 and 200 nm in diameter) of alumina membranes have a significant effect on leukocyte morphology and activation. Specifically, our results show that 20-nm pore-size membranes were more potent in triggering PMN spreading and extending of pseudopodia than 200-nm pore-size membranes. The morphological changes are also associated with cell activation. In fact, adherent neutrophils on 20-nm pore-size membranes elicit much stronger initial oxygen free radical production. Overall, our results point out that membrane pore size significantly affects the extent of cellular responses of adherent neutrophils.

  • 162.
    Karlsson, Martin
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Indrek, Jõgi
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Eriksson, Susanna K
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Rensmo, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Surface and Interface Science.
    Boman, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Boschloo, Gerrit
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Dye-sensitized solar cells employing a SnO2-TiO2 core-shell structure made by atomic layer depositionIn: Advanced Energy MaterialsArticle in journal (Refereed)
    Abstract [en]

    This paper describes the synthesis and characterization of core-shell structures, based on a SnO2 and TiO2 for use in dye-sensitized solar cells (DSC). Atomic layer deposition is employed to control and vary the thickness of the TiO2 shell. Increasing the TiO2 shell thickness to 2 nm improves the device performance of liquid electrolyte DSC from 0.7 % to 3.5 %. The increase in efficiency originates from a higher open-circuit potential and a higher short-circuit current as well as an improvement in the electron lifetime. SnO2-TiO2 core-shell DSC devices retain their photo-voltage in darkness for longer than 500 seconds showing that electrons are contained in the core material. Finally core-shell structures were used for solid-state DSC applications using the hole transporting material 2,2’,7,7’,-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9’,-spirofluorene. Similar increases in devices performance are seen for these solid-state DSC devices.

  • 163. Katumba, G
    et al.
    Lu, J
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Physics, Department of Physics and Materials Science, Experimental Physics.
    Olumekor, L
    Westin, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Physics, Department of Physics and Materials Science, Experimental Physics. oorganisk kemi.
    Wäckelgård, E
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Physics, Department of Physics and Materials Science, Experimental Physics. Fasta tillståndets fysik.
    Low Cost Selective Solar Absorber Coatings: Characteristics of Carbon-In-Silica Synthesized with Sol-Gel Technique2005In: Journal of Sol-Gel Science and Technology, ISSN 0928-0707 (Paper) 1573-4846 (Online), Vol. 36, p. 33-43Article in journal (Refereed)
    Abstract [en]

    Carbon-silica composite films have been fabricated using sol-gel synthesis of silica-carbon precursor composites, followed by carbonization in an inert atmosphere. Four categories of samples were studied. These were the tetraethyl orthosilicate-only (TEOS-only), methyl trimethoxysilane (MTES), acetic acid anhydride (Ac2O) and soot (SOOT) samples. The carbon-silica films, spin-coated on aluminium and steel substrates, have been investigated for selective solar absorber functionality. Optical measurements were performed on these samples to determine solar absorptance and thermal emittance of each. The morphology of the films was studied by electron microscopy. Electron energy-loss spectroscopy (EELS) mapping was used to determine the carbon distribution. An optimum performance of 0.88 for solar absorptance and 0.41 for thermal emittance has been achieved. The sol-gel technique produced films with very flat surfaces and uniform thicknesses in the 1 μm range. The fine structure showed homogeneous mixing of the carbon and silica in the TEOS-only samples while the separate additions of MTES and Ac2O resulted in segregation of composition of the silica and carbon at nano-scale. The addition of 20 wt% MTES or 15 wt% Ac2O to the TEOS-only sols also helped to reduce the cracks in the TEOS-only samples. The addition of soot in place of the carbon precursor did not yield a net advantage.

  • 164.
    Klett, Oliver
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Bergman, David
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Nyholm, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Integrated on-chip electrophoresis and electrochemical detection of neurotransmitters2004In: ESEAC'04, Galway, Ireland, 2004Conference paper (Refereed)
  • 165.
    Klett, Oliver
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Physics, Department of Physics and Materials Science, Materials Science. Materialvetenskap.
    Bergman, David
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Physics, Department of Physics and Materials Science, Materials Science. Materialvetenskap.
    Nyholm, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Physics, Department of Physics and Materials Science, Materials Science. oorganisk kemi.
    Nikolajeff, Fredrik
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Physics, Department of Physics and Materials Science, Materials Science.
    Deviceless Decoupling of HV-field Effects on Integrated Amperometry in an On-Chip CE System2004In: 55th Annual Meeting of ISE, Thessaloniki, Greece, 2004Conference paper (Refereed)
  • 166. Klett, Oliver
    et al.
    Nyholm, Leif
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Bergman, D
    Integrated On-Chip Electrophoresis and Electrochemical Detection of Neurotransmitters2004In: presented at the 17th International Symposium on Microscale separations and capillary electrophoresis (HPCE), Salzburg, 8-12 February, 2004, 2004Conference paper (Refereed)
  • 167. Kloss, Frank
    et al.
    Gassner, Robert
    Preiner, Johannes
    Ebner, Andreas
    Larsson, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hächl, Oliver
    Tuli, Tarkan
    Rasse, Michael
    Moser, Doris
    Laimer, Klaus
    Nickel, Eike
    Laschober, Gerhard
    Brunauer, Regina
    Klima, Günther
    Hinterdorfer, Peter
    Steinmüller-Nethl, Doris
    Lepperdinger, Günter
    The role of oxygen termination of nanocrystalline diamond on immobilisation of BMP-2 and subsequent bone formation2008In: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 29, no 16, p. 2433-2442Article in journal (Refereed)
    Abstract [en]

    Medical implants are increasingly often inserted into bone of frail patients, who are advanced in years. Due to age, severe trauma or pathology-related bone changes, osseous healing at the implant site is frequently limited. We were able to demonstrate that coating of endosseous implants with nanocrystalline diamond (NCD) allows stable functionalization by means of physisorption with BMP-2. Strong physisorption was shown to be directly related to the unique properties of NCD, and BMP-2 in its active form interacted strongly when NCD was oxygen-terminated. The binding of the protein was monitored under physiological conditions by single molecule force spectroscopy, and the respective adsorption energies were further substantiated by force-field-calculations. Implant surfaces refined in such a manner yielded enhanced osseointegration in vivo, when inserted into sheep calvaria. Our results further suggest that this technical advancement can be readily applied in clinical therapies with regard to bone healing, since primary human mesenchymal stromal cells strongly activated the expression of osteogenic markers when being cultivated on NCD physisorbed with physiological amounts of BMP-2.

  • 168.
    Knut, Ronny
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Surface and Interface Science.
    Wikberg, J. Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Lashgari, Koroush
    Coleman, Victoria A.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Westin, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Karis, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Surface and Interface Science.
    Magnetic and electronic characterization of highly Co-doped ZnO: An annealing study at the solubility limit2010In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 9, p. 094438-Article in journal (Refereed)
    Abstract [en]

    We report on investigations of the electronic structure and magnetic properties of ZnO doped with 15 at. % Co and postgrowth annealed at temperatures ranging between 250 and 800°C. In particular, we demonstrate how the presence of Co3+, indicative of secondary phases, is manifested in spectroscopy. Through resonant photoemmision spectroscopy we have found that x-ray diffraction in some cases underestimates or does not reveal the presence of secondary phases, possibly due to unrelaxed structures or structural arrangements with sizes below the detection limit. The magnetic properties are in most cases understood by assuming small antiferromagnetic clusters but can also show a behavior indicative of ferromagnetic interactions.

  • 169.
    Kritikos, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Moustiakimov, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Wijk, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Westin, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Synthesis, structure and characterisation of Ln(5)O(OPri)(13) with Ln = Nd, Gd or Er2001In: JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, ISSN 1472-7773, no 13, p. 1931-1938Article in journal (Refereed)
    Abstract [en]

    The molecular and basically isostructural oxo-alkoxides Ln(5)O(OPri)(13) (Pr-i = 2-propyl) with Ln = Nd (1) and Gd (2) were synthesized by metathesis of LnCl(3) and KOPri, in combination with stoichiometric hydrolysis, in 2-propanol-containing solvents. E

  • 170. Kritikos, Mikael
    et al.
    Ekstrand, Åsa
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leideborg, Michael
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Westin, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Synthesis, Structure and Properties of Na2Zn(OEt)4(HOEt)52004In: Journal of Sol-Gel Science and Technology, Vol. 32, p. 19-23Article in journal (Refereed)
    Abstract [en]

    The synthesis, structure and properties of Na2Zn(OEt)4(HOEt)5, having the right Na:Zn ratio for sol-gel synthesis of the highly Na-ion conducting ceramic Nai1.8Zn0.9Si1.1O4, is described. It was synthesised in high yield by a metathesis reaction of ZnCl2 and 4NaOEt in ethanol or ethanol/toluene solvent. The structure was determined by single-crystal X-ray methods and consists of two symmetry related polymeric strands with the metal sequence ...-Zn-Na-Na-Zn-.... Extensive hydrogen bonding is present within each chain. Further characterization was lmade with IR- and Raman-spectroscopy and thermo-calorimetry, showing that the compound is stable to 65°C.

  • 171. Kritikos, Mikael
    et al.
    Westin, Gunnar
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Synthesis, Structure and Properties of ErNb2(OPri)132004In: Journal of Sol-Gel Science and Technology, Vol. 32, p. 25-29Article in journal (Refereed)
    Abstract [en]

    The molecular alkoxide, ErNb2(OPri)13 was prepared by metathesis with 2KNb(OPri)6, KOPri and ErCl3, and structurally determined by single-crystal X-ray diffraction techniques. Each molecule contains a central Er3+-ion coordinates by six OPri groups placed, one via a double alkoxo-bridge and the other via a triple alkoxo.bridge. It is isostructural with LaNb2(OPri)13, in spite of the large difference in ionic radius between Er3+ and La3+ (16%). The compound was characterized by its IR- and UV-vis-NIR-spectroscopic fine structures, and found to be structurally intact in hexane:isopropanol solution.

  • 172. Kudou, K
    et al.
    Okada, S
    Mori, T
    Iizumi, K
    Shishido, T
    Tanaka, T
    Higashi, I
    Nakajima, K
    Rogl, P
    Andersson, Yvonne
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Lundström, Torsten
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Crystal Growth and Properties of AlLiB142002In: Jpa. J. Appl. Phys., Vol. 41, no 8B, p. L958-930Article in journal (Refereed)
  • 173.
    Kukli, K
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Aarik, J
    Aidla, A
    Forsgren, K
    Sundqvist, J
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Uustare, T
    Mändar, H
    Kiisler, A. -A
    Atomic layer deposition of tantalum oxide thin films from iodide precursor2001In: Chem. Mater., Vol. 13, p. 122-Article in journal (Refereed)
  • 174.
    Kukli, K
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Aidla, A
    Department of Materials Chemistry, Inorganic Chemistry.
    Aarik, J
    Department of Materials Chemistry, Inorganic Chemistry.
    Schuisky, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Ritala, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Leskelä, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Real time monitoring in atomic layer deposition of TiO2 from TiI4 and H2O-H2O22000In: Langmuir, Vol. 16, p. 8122-Article in journal (Refereed)
  • 175. Kukli, K
    et al.
    Forsgren, K
    Aarik, J
    Niskanen, A
    Ritala, M
    Leskelä, M
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Atomic layer deposition of zirconium oxide from zirconium tetraiodide, water and hydrogen peroxide2001In: J. Crystal Growth, Vol. 231, p. 262-Article in journal (Refereed)
  • 176. Kukli, K
    et al.
    Forsgren, K
    Ritala, M
    Leskelä, M
    Aarik, J
    Hårsta, A
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Dielectric properties of zirconium oxide grown by atomic layer deposition from iodide precursors2001In: J. Electrochem. Soc., Vol. 148, p. F227-Article in journal (Refereed)
  • 177.
    Kukli, K.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Ritala, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Schuisky, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Leskelä, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Sajavaara, T
    Department of Materials Chemistry, Inorganic Chemistry.
    Keinonen, J
    Department of Materials Chemistry, Inorganic Chemistry.
    Uustarem, T
    Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Atomic layer deposition of titanium oxide from TiI4 and H2O22000In: Chem. Vap. Deposition, Vol. 6, p. 303-Article in journal (Refereed)
  • 178. Kukli, K.
    et al.
    Ritala, M.
    Uustare, T.
    Aarik, J.
    Forsgren, Katarina
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Sajavaara, T.
    Leskelä, M.
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Influence of thickness and growth temperature on the properties of zirconium oxide films grown by atomic layer deposition on silicon2002In: Thin Solid Films, no 410, p. 53-60Article in journal (Refereed)
  • 179. Kukli, Kaupo
    et al.
    Aaltonen, Titta
    Aarik, Jaan
    Lu, Jun
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Ritala, Mikko
    Ferrari, Sandro
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leskelä, Markku
    Atomic Layer Deposition and Characterization of HfO2 Films on Noble Metal2005In: Journal of The Electrochemical Society, Vol. 152, no 7, p. F75-F82Article in journal (Refereed)
    Abstract [en]

    HfO2 films were grown by atomic layer deposition from HfCl4 and H2O on atomic layer deposited 40-70 nm thick platinum, iridium, and ruthenium films in the temperature range 200-600°C. The phase formed in the 30-50 nm thick HfO2 films was monoclinic HfO2 dominating over amorphous material without noticeable contribution from metastable crystallographic polymorphs. The metal-dielectric-metal capacitor structures formed after evaporating Al gate electrodes demonstrated effective permittivity values in the range 11-16 and breakdown fields reaching 5 MV/cm. Iridium electrode films showed the highest stability in terms of reliability and reproducibility of dielectric characteristics.

  • 180. Kukli, Kaupo
    et al.
    Aarik, Jaan
    Ritala, Mikko
    Uustare, Teet
    Sajavaara, Timo
    Lu, Jun
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Sundqvist, Jonas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Aidla, Aleks
    Pung, Lembit
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leskelä, Markku
    Effect of selected atomic layer deposition parameters on the structure and dielectric properties of hafnium oxide films2004In: Journal of Applied Physics, Vol. 96, no 9, p. 5298-5307Article in journal (Refereed)
    Abstract [en]

    Hf02 films were atomic layer deposited from HfCl4 and H20 on

    Si(lOO) in the temperature range of 226-750 °C. The films consisted of dominantly the monoclinic polymorph. Elastic recoil

    detection analysis revealed high residual chlorine and hydrogen contents (2-5 at. %) in the films grown below 300-350 °C. The content of residual hydrogen and chlorine monotonouslydecreased with increasing growth temperature. The effctive permittivity insignificantly depended on the

    growth temperature and water partial pressure. Capacitance-voltage curves exhibited market hysteresis especially in the films grown at 400-450 ° C, and demonstrated enhanced distortions likely due to the increased trap densities in the films grown at 700-750 °C. Changes in water pressure led to some changes in the extent of crystallization, but did not induce any clear change; in the capacitance of the dielectric layer.

  • 181. Kukli, Kaupo
    et al.
    Aarik, Jaan
    Uustare, Teet
    Lu, Jun
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Ritala, Mikko
    Aidla, Aleks
    Oung, Lembit
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leskelä, Markku
    Kikas, Arvo
    Sammelselg, Väino
    Engineering structure and properties of hafnium oxide films by atomic layer deposition temperature2005In: Thin Solid Films, Vol. 479, no 1-2, p. 1-11Article in journal (Refereed)
    Abstract [en]

    HfO2 films were atomic layer deposited from HfCl4 and H2O on Si(100) in the temperature range of 300–600 °C. At low temperatures, films grow faster and are structurally more disordered, compared to films grown at high temperatures. At high temperatures, the films are better crystallized, but grow slower and contain grain boundaries extending from substrate to gate electrode. Film growth rate and capacitance of HfO2 dielectric layers was improved by depositing stacked structures with polycrystalline films of higher purity at 600 °C on thin HfO2 sublayer grown on Si at 300 °C.

  • 182. Kukli, Kaupo
    et al.
    Ritala, Mikko
    Lu, Jun
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leskelä, Markku
    Properties of Hf02 Thin Films Grown by ALD from Hafnium tetrakis(ethylmethylamide) and Water2004In: Journal of The Electrochemical Society, Vol. 151, no 8, p. F189-F193Article in journal (Refereed)
    Abstract [en]

    Hf02 films were grown by atomic layer deposition (ALD) from

    Hf[N(CH3)(C2H5)]4 and H2O on Si(lOO) substrates. The Thickness of 5-45 nm thick films on HF-etched SI was proportinal to the number of growth cycles. Crystallization was observed

    in the 30-45 nm thick films, containing the monoclinic Hf02 polymorph. Films with thicknesses lower than 10 nm were

    amorphous. The effective permittivity of the dielectric films varied between 6.5 and 17. The leakage and capacitive characteristics did not show any clear dependence on the HfO2 growth temperature.

  • 183. Kukli, Kaupo
    et al.
    Ritala, Mikko
    Sundqvist, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Aarik, Jaan
    Lu, Jun
    Sajavaara, Timo
    Leskelä, Markku
    Hårsta, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Properties of hafnium oxide films grown by atomic layer deposition from hafnium tetraiodide and oxygen2002In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 92, no 10, p. 5698-5703Article in journal (Refereed)
  • 184.
    Kvashnina, K.O.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Butorin, S.M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Modin, A
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Werme, L
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Nordgren, J
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics II.
    Guo, J.-H.
    Berger, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Electronic structure of complex copper systems probed by resonant inelastic X-ray scattering at Cu L3 edge2009In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 404, no 20, p. 3559-3566Article in journal (Refereed)
    Abstract [en]

    We have used X-ray absorption (XA) and resonant inelastic X-ray scattering (RIXS) spectroscopies to study a series of copper compounds, namely Cu2O, CuO, Cu(OH)2, CuCl2, Cu2S, CuSO4, malachite (Cu2(CO3)2(OH)2) and atacamite (CuCl2·3Cu(OH)2). Cu 2p XA spectra provide information about oxidation states. Divalent copper gives a single narrow line due to excitations into the empty 3d state, whereas monovalent copper gives a broad band at higher energy due to transitions to 4s states. Chemical shifts of the main line in the Cu2+ XA spectra of different compounds are observed but in some cases they are too small to make a clear distinction between the species. It is shown that RIXS at the Cu 2p edge has a great potential to distinguish between the species due to large differences in spectral shapes for the same energy of the incident photon beam. First evidence for the possibility of detecting chemical composition of copper compounds is presented and discussed in details.

  • 185. Käämbre, T
    et al.
    Qian, L
    Rubensson, J.-E.
    Guo, J.-H.
    Såthe, C
    Nordgren, J
    Palmqvist, J.-P.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Jansson, Ulf
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Study of oxygen-C compound formation by NEXAFS and RIXS2001In: The European Physical Journal D, Vol. 16, no 1-3, p. 357-360Article in journal (Refereed)
    Abstract [en]

    The interaction of oxygen with C60 molecules was studied on a C60 film which had been exposed simultaneously to oxygen and UV-light for 190 hours, producing an approximately C60O1 stoichiometry in the bulk of the sample. C K-edge and O K-edge NEXAFS (using total fluorescence yield detection) and resonant X-ray inelastic scattering (RIXS) spectra from the sample film were measured and the C K-edge data were compared to the spectra from pristine C60 as reference. The C K-edge absorption and emission spectral profiles of the oxygen-doped sample are similar to those of the C60 reference, suggesting that cage breaking of C60 under these conditions, if any, is negligible. However, the redistribution of intensities in the spectra indicates changes in the occupancies of different molecular orbitals, possibly due to changes in electron density upon reaction. Similarities of the O K-edge soft X-ray emission (SXES) spectra to several small oxygen-containing molecules is being discussed in terms of bonding models.

  • 186.
    Landström, Lars
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Brodoceanu, D
    Bäuerle, D
    Garcia-Vidal, J
    Rodrigo, Sergio G.
    Martin-Moreno, L
    Extraordinary transmission through metal-coated monolayers of microspheres2009In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 2, p. 761-772Article in journal (Refereed)
    Abstract [en]

    The spectral dependence of the extraordinary transmission through monolayers of close-packed silica or polystyrene microspheres on a quartz support, covered with different thin metal films (Ag, Au and Ni) was investigated. The measured spectra were compared with modeled transmission spectra using finite difference time domain (FDTD) calculations. Measured and modeled spectra show good overall agreement. The supported modes in the sphere array were found to be of utmost importance for the transmission mechanism and the results also suggest that the presence of guided modes in the photonic crystal may further enhance the extraordinary transmission through the metal film.

  • 187.
    Landström, Lars
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. oorganisk kemi.
    Elihn, K
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. oorganisk kemi.
    Boman, Mats
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. oorganisk kemi.
    Granqvist, C
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Heszler, Peter
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Technology, Department of Engineering Sciences, Solid State Physics. Fasta tillståndets fysik.
    Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene2005In: Applied Physics A, ISSN 1432-0630, Vol. 81, p. 827-833Article in journal (Refereed)
    Abstract [en]

    Thermal radiation, originating from laser-heated gas-phase nanoparticles, was detected in the 400–700 nm wavelength range by means of optical emission spectroscopy. The particles were formed upon laser-induced photolytic decomposition of ferrocene (Fe(C5H5)2) and consisted of an iron core surrounded by a carbon shell. The laser-induced excitation was performed as the particles were still within the reactor zone, and the temperature of the particles could be determined from thermal emission. Both the temperature of the nanoparticles and the relative intensity changes of the emission were monitored as a function of time (with respect to the laser pulse), laser fluence and Ar ambient pressure. At high laser fluences, the particles reached high temperatures, and evidence was found for boiling of iron. Modeling of possible energy-releasing mechanisms such as black-body radiation, thermionic electron emission, evaporation and heat transfer by the ambient gas was also performed. The dominant cooling mechanisms at different ranges of temperature were clarified, together with a determination of the accommodation factor for the Ar–nanoparticle collisions. The strong evaporation at elevated temperatures also led to significant iron loss from the produced particles.

  • 188.
    Landström, Lars
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Márton, Z. S
    Boman, Mats
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Heszler, Peter
    Monitoring nanoparticle formation during laser ablation of graphite in an atmospheric-pressure ambient2004In: Applied Physics A, Vol. 79, no 3, p. 537-542Article in journal (Refereed)
    Abstract [en]

    Excimer laser ablation of highly oriented pyrolytic graphite (HOPG) was performed at atmospheric pressure in an N2 and in an air ambient. During the ablation, nanoparticles condensed from the material ejecta, and their size distribution was monitored in the gas phase by a Differential Mobility Analyzer (DMA) in combination with a Condensation Particle Counter (CPC). Size distributions obtained at different laser repetition rates revealed that the interaction between subsequent laser pulses and formed particles became significant above 15 Hz. This interaction resulted in laser heating, leading to considerable evaporation and a decrease in the size of the particles. X-ray photoelectron spectroscopy revealed that approximately 8% nitrogen was incorporated into the CNx particles generated in the N2 ambient, and that the nitrogen was mostly bonded to sp3-hybridized carbon. Monodisperse particles were also deposited and were analyzed by means of Raman spectroscopy to monitor size-induced effects.

  • 189.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Adsorption of hydrocarbon species on a stepped diamond (111) surface1997In: PHYSICAL REVIEW B-CONDENSED MATTER, ISSN 0163-1829, Vol. 56, no 23, p. 15452-15458Article in journal (Other scientific)
    Abstract [en]

    The process of adsorption of H, CH3, CH2, C2H, and C2H2, on various steps on the diamond (111) surface, has been investigated theoretically. The first-principles density-functional theory was then used in order to calculate the binding energies and equili

  • 190.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorgansik kemi.
    CVD growth of cubic boron nitride; A theoretical/experimantel approach2006In: Wide Band Gap Materials and New Developments, 2006, Research Signpost 37/661 (2), Fort P. O., rivandrum-695 023; Kerala, India , 2006, p. 41-67Chapter in book (Refereed)
    Abstract [en]

    Cubic boron nitride (c-BN) exhibits an extraordinary combination of physical and chemical properties (hardness, High thermal conductivity, transparency) which is comparable or even superior to diamond in what concerns its ability to be doped as both n- and p-type semiconductor, and its higher chemical stability and lower reactivity at high temperatures. All these properties strongly suggest that c-BN is an extremely promising multifunctional material, which could be tailored for a very large range of advanced applications, such as micro- and opto-electronics, electron emission devices, radiation detection, biosensing, high temperature and/or radiation resistant devices.

  • 191.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    CVD growth of cubic boron nitride: A theoretical/experimental approach2006In: Thin Solid Films, Vol. 515, no 2, p. 401-406Article in journal (Refereed)
    Abstract [en]

    Similarities and dissimilarities in the growth of diamond vs. c-BN, in the present series of investigations, have been studied using quantum mechanical calculations. Hydrogen species have been observed to be very effective in stabilising both types of compounds. Very large similarities have also been observed when considering the adsorption of various growth species to these materials. However, it was found necessary to avoid mixtures of B- and N-containing species in the gas phase during c-BN growth, since they should most probably result in a mixture of these species also on the (111) and (110) surfaces. In addition, a careful gas phase design was found necessary in order to avoid a preferential initial growth of h-BN. These theoretical results can be used as guide lines in striving towards a thin film deposition of cubic boron nitride using gentle CVD methods like atomic layer deposition.

  • 192.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Gas-phase stability of c-BN clusters2001In: JOURNAL DE PHYSIQUE IV, ISSN 1155-4339, Vol. 11, no PR3, p. 423-430Article in journal (Refereed)
    Abstract [en]

    The stability of various cluster-sizes of H- and F-terminated c-BN, compared to corresponding clusters of h-BN, has been investigated theoretically using the ab initio molecular orbital method at the MP2 order of theory. For comparison, a corresponding in

  • 193.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Migration of Species on a Diamond (111) Surface1998In: Proceedings of the second symposium on Diamond Materials V. Vol. 97-32, 1998Conference paper (Refereed)
  • 194.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Precursor design in c-BN growth2002In: Diamond and Related Materials, Vol. 11, p. 1300-1304Article in journal (Refereed)
  • 195.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Precursor Design of Vapour Deposited Cubic Boron Nitride Versus Diamond2003In: Proceedings of the Estonian Academy of Sciences, Physics Mathematics, Estonia, 2003Conference paper (Refereed)
  • 196.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Reaction of Diamond Surfaces with Halogen-Containing Species1995In: Mat. Res. Soc. Symp. Proc. 416, 1995, p. 287-Conference paper (Refereed)
  • 197.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Substitutional n-type doping of diamond2003In: Computational Materials Science, Vol. 27, p. 23-29Article in journal (Refereed)
  • 198.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Substitutional n-Type Doping of Diamond during Growth. A Theoretical Approach Using Extremes in Surface Chemistry.2002In: Phys.Stat.Sol. (a), Vol. 193, no 1, p. 409-414Article in journal (Refereed)
  • 199.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Surface Processes During Diamond Growth1999In: Proceedings of ADC/FCD ´99, 1999, p. 42-47Conference paper (Refereed)
  • 200.
    Larsson, Karin
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Surface Properties of Diamond under Atmospheric Conditions: A Quantum Mechanical Approach2005In: New Diamond and Frontier Carbon Technology Vol. 15 No. 5, 2005, p. 229-246Chapter in book (Refereed)
1234567 151 - 200 of 524
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