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  • 1.
    Berger, Rolf
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Oorganisk kemi.
    Bucur, Romulus V.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Oorganisk kemi.
    Diffusion in Copper Sulphides: An experimental study of chalcocite, chalcopyrite and bornite1996Report (Other scientific)
    Abstract [en]

    Diffusion measurements on three copper-containing sulphides have been performed by an electrochemical potentiometric method. -- The diffusion coefficient for chalcocite is in good agreement with values found previously, and a reasonable agreement is also found for chalcopyrite and bornite when our data are compared with values acquired at much higher temperatures with a different technique. The activation energies are remarkably similar for the three sulphides, considering that their relative errors are of a 10% magnitude, which indicates that the bonding strengths and the diffusion mechanisms are similar.

  • 2.
    Högberg, Hans
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Malm, JO
    Talyzin, A
    Norin, L
    Lu, J
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Deposition of transition metal carbides and superlattices using C-60 as carbon source2000In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY, ISSN 0013-4651, Vol. 147, no 9, p. 3361-3369Article in journal (Refereed)
    Abstract [en]

    Thin films of TiC, VC, and NbC have been deposited on MgO(001) by coevaporation of the metals and C-60 It was found that these metals induced a decomposition of the C-60 molecule and that carbide films can be formed at a temperature as low as 100 degrees

  • 3.
    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)
  • 4.
    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)
  • 5.
    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)
  • 6.
    Lee, SK
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Zetterling, CM
    Danielsson, E
    Ostling, M
    Palmquist, Jens-Petter
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Högberg, Hans
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Electrical characterization of TiC ohmic contacts to aluminum ion implanted 4H-silicon carbide2000In: APPLIED PHYSICS LETTERS, ISSN 0003-6951, Vol. 77, no 10, p. 1478-1480Article in journal (Refereed)
    Abstract [en]

    We report on the investigation of epitaxial TiC ohmic contacts to Al ion implanted 4H-SiC. TiC ohmic contacts were formed by coevaporation of Ti and C-60 at low temperature (< 500 degrees C). A sacrificial silicon nitride (Si3N4) layer was deposited on th

  • 7.
    Lee, SK
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Zetterling, CM
    Ostling, M
    Palmquist, Jens-Petter
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Högberg, H
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Low resistivity ohmic titanium carbide contacts to n- and p-type 4H-silicon carbide2000In: SOLID-STATE ELECTRONICS, ISSN 0038-1101, Vol. 44, no 7, p. 1179-1186Article in journal (Refereed)
    Abstract [en]

    Low resistivity Ohmic contacts of epitaxial titanium carbide to highly doped n- (1.3 x 10(19) cm(-3)) and p- (>10(20) cm(-3)) type epilayer on 4H-SiC were investigated. The titanium carbide contacts were epitaxially grown using coevaporation with an e-bea

  • 8.
    Liljegren, G
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Nyholm, Leif
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Electrochemically Controlled Solid Phase Microextraction and Preconcentration using Polypyrrole Coated Microarray Electrodes in a Flow System2003In: presented at the 26th International Symposium on Capillary Chromatography & Electrophoresis, Las Vegas, USA, May 18-22, 2003, 2003Conference paper (Refereed)
  • 9.
    Liljegren, Gustav
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Dahlin, Andreas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Zettersten, Camilla
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Bergquist, Jonas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Nyholm, Leif
    Department of Materials Chemistry, Inorganic Chemistry. Oorganisk kemi.
    On-line coupling of a microelectrode array equipped poly(dimethylsiloxane) microchip with an integrated graphite electrospray emitter for electrospray ionisation mass spectrometry2005In: Lab on a Chip, no 5, p. 1008-1016Article in journal (Refereed)
    Abstract [en]

    A novel method for the manufacturing of microchips for on-chip combinations of electrochemistry (EC) and sheathless electrospray ionisation mass spectrometry (ESI-MS) is described. The technique, which does not require access to clean-room facilities, is based on the incorporation of an array of gold microcoil electrodes into a poly(dimethylsiloxane) (PDMS) microflow channel equipped with an integrated graphite based sheathless ESI emitter. Electrochemical measurements, which were employed to determine the electroactive area of the electrodes and to test the microchips, show that the manufacturing process was reproducible and that the important interelectrode distance in the electrochemical cell could to be adequately controlled. The EC-ESI-MS device was evaluated based on the ESI-MS detection of the oxidation products of dopamine. The results demonstrate that the present on-chip approach enables full potentiostatic control of the electrochemical cell and the attainment of very short transfer times between the electrochemical cell and the electrospray emitter. The transfer times were 0.6 and 1.2 s for flow rates of 1.0 and 0.5 uL min-1, respectively, while the electrochemical conversion efficiency of the electrochemical cell was found to be 30% at a flow rate of 0.5 uL min-1. To decouple the electrochemical cell from the ESI-MS high voltage and to increase the user-friendliness, the on-line electrochemistry-ESI-MS experiments were performed using a wireless Bluetooth battery-powered instrument with the chip floating at the potential induced by the ESI high voltage. The described on-chip EC-ESI-MS device can be used for fundamental electrochemical investigations as well as for applications based on the use of electrochemically controlled sample pretreatment, preconcentration and ionisation steps prior to ESI-MS.

  • 10.
    Liljegren, Gustav
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Forsgard, Niklas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Zettersten, Camilla
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Pettersson, Jean
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry. Analytisk kemi.
    Svedberg, Malin
    Herranen, Merja
    Department of Materials Chemistry, Inorganic Chemistry. Oorganisk kemi.
    Nyholm, Leif
    Department of Materials Chemistry, Inorganic Chemistry. Oorganisk kemi.
    On-line electrochemically controlled solid-phase extraction interfaced to electrospray and inductively coupled plasma mass spectrometry2005In: The Analyst, no 130, p. 1358-1368Article in journal (Refereed)
    Abstract [en]

    Electrochemically controlled solid-phase extractions of anions were interfaced on-line to electrospray mass spectrometry (ESI-MS) and inductively coupled plasma mass spectrometry (ICP-MS), using polypyrrole coated electrodes and a thin-layer electrochemical (EC) flow cell. The results indicate that electrochemically controlled solid-phase extraction (EC-SPE) can be used as a versatile potential controlled sample preparation technique for a range of anions and that the properties of the polypyrrole coatings can be modified by altering the electrodeposition conditions. In the present study, the influence of interfering anions (i.e., fluoride and sulfate), and the anion used during the electropolymerisation, on the bromide extraction recovery was investigated for EC-SPE interfaced to ICP-MS. The results of these experiments show that the interference due to the presence of similar concentrations of sulfate can be reduced when using a polypyrrole coating electropolymerised in the presence of bromide ions. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements were also used to study the morphology of the coatings, as well as the variations in the film thickness within the coatings. The effect of different desorption techniques on the bromide preconcentration factor in the ICP-MS on-line flow system was also examined. Stopped-flow desorption was found to give rise to significantly increased preconcentration factors in comparison with desorptions in flowing solutions. While the desorption efficiency depends on the type of desorption electrolyte (the electrolyte in which the desorption takes place), due to the competing influx of cations, the influence of the pH on the switching charge of the polypyrrole coating was found to be small, at constant ionic strength. To study the applicability of the EC-SPE technique with respect to real samples, investigations were also made with tap water samples spiked with different bromide concentrations. The results of these experiments, which were carried out using a modified thin-layer EC flow cell allowing in situ polymerisation of polypyrrole yielding a polymer plug covering the cross section of the channel, demonstrate that 3 uM concentrations of bromide could be detected in the tap water sample. This demonstrates that the extraction technique allows extractions of low concentrations of ions in the presence of significantly higher concentrations of other similar ions. The fact that the extraction and desorption steps are electrochemically controlled makes EC-SPE particularly well suited for inclusion in miniaturised lab-on-a-chip systems.

  • 11.
    Lu, J
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Hugosson, H
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Eriksson, Olle
    Nordström, Lars
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Chemical vapour deposition of molybdenum carbides: aspects of phase stability2000In: THIN SOLID FILMS, ISSN 0040-6090, Vol. 370, no 1-2, p. 203-212Article in journal (Refereed)
    Abstract [en]

    Thin films of different molybdenum carbides (delta-MoC1-x, gamma'-MoC1-x and Mo2C) have been deposited from a gas mixture of MoCl5/H-2/C2H4 at 800 degrees C by CVD. The H-2 content in the vapour has a strong influence on the phase composition and microstr

  • 12.
    Lundberg, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Ostling, M
    Zetterling, CM
    Tagtstrom, P
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    CVD-based tungsten carbide Schottky contacts to 6H-SiC for very high-temperature operation2000In: JOURNAL OF ELECTRONIC MATERIALS, ISSN 0361-5235, Vol. 29, no 3, p. 372-375Article in journal (Refereed)
    Abstract [en]

    In this study, tungsten carbide, with its hardness, chemical inertness, thermal stability and low resistivity (25 mu Omega cm)(1) is shown as a reliable contact material to n- and p-type 6H-SiC for very high temperature applications. WC films with thickne

  • 13.
    Schuisky, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Aidla, A
    Department of Materials Chemistry, Inorganic Chemistry.
    Kukli, K
    Department of Materials Chemistry, Inorganic Chemistry.
    Kiisler, A.A
    Department of Materials Chemistry, Inorganic Chemistry.
    Aarik, J
    Department of Materials Chemistry, Inorganic Chemistry.
    Atomic layer chemical vapor deposition of TiO2: Low-temperature epitaxy of rutile and anatase2000In: J. Electrochem. Soc., Vol. 147, p. 3319-Article in journal (Refereed)
  • 14.
    Schuisky, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Khartsev, S
    Department of Materials Chemistry, Inorganic Chemistry.
    Grishin, A
    Department of Materials Chemistry, Inorganic Chemistry.
    Ferroelectric Bi4Ti3O12 thin films on Pt-coated silicon by halide chemical vapor deposition2000In: J. Appl. Phys., Vol. 88, p. 2819-Article in journal (Refereed)
  • 15.
    Schuisky, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Kukli, K
    Department of Materials Chemistry, Inorganic Chemistry.
    Ritala, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Hårsta, Anders
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Leskelä, M
    Department of Materials Chemistry, Inorganic Chemistry.
    Atomic layer chemical vapour deposition in the Bi-Ti-O system2000In: Chem. Vap. Deposition, Vol. 6, p. 139-Article in journal (Refereed)
  • 16.
    Talyzin, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    C-60 and C-70 solvates studied by Raman spectroscopy2000In: JOURNAL OF PHYSICAL CHEMISTRY B, ISSN 1089-5647, Vol. 104, no 21, p. 5064-5071Article in journal (Refereed)
    Abstract [en]

    The formation and phase transformations of C-60 and C-70 solvates with benzene, toluene, and n-hexane have been studied in-solution by Raman spectroscopy for the first time. It was found that C-60 and C-70 solvates exhibit Raman spectra which are quite di

  • 17.
    Talyzin, AV
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Chemistry. Department of Materials Chemistry, Inorganic Chemistry.
    Tergenius, LE
    Jansson, Ulf
    Department of Materials Chemistry, Inorganic Chemistry. oorganisk kemi.
    Single-crystal growth of C70S8 - a new phase in the C-70-sulphur system2000In: JOURNAL OF CRYSTAL GROWTH, ISSN 0022-0248, Vol. 213, no 1-2, p. 63-69Article in journal (Refereed)
    Abstract [en]

    Large crystals (up to 2 x 1 x 0.5 mm) of a new C-70-sulphur compound were grown by evaporation of a benzene solution. The composition of this compound was determined by chemical analysis to C70S8. Single-crystal and X-ray powder diffraction experiments sh

  • 18.
    Thorslund, Sara
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Bergström, S
    Johanesson, N
    Pettersson, A
    Liljegren, G
    Magnusson, K
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
    Hallberg, M
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
    Klett, Oliver
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Bergquist,, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry, Analytical Chemistry.
    Nyholm, Leif
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Markides, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Materials Science.
    Nyberg, F
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Materials Science.
    Nikolajeff, Fredrik
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Essential components in an integrated platform for on-site screening of anabolic androgenic steroids in biological samples2004In: Micro Total Analysis Systems 2004: Vol 1 / [ed] Laurell T; Nilsson J; Jensen K; Harrison DJ; Kutter JP, 2004Conference paper (Refereed)
    Abstract [en]

    In this abstract new results concerning the introduction of a biological sample into a mu TAS, the avoidance of unspecific absorbance in the mu TAS and the interfacing to off-chip detection (e.g. Mass spectrometry, MS) for verification are presented.

1 - 18 of 18
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