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Lindblad, Rebecka, DrORCID iD iconorcid.org/0000-0001-6162-1167
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Publications (10 of 51) Show all publications
Fritze, S., Hahn, R., Aboulfadl, H., Johansson, F. O. .., Lindblad, R., Böör, K., . . . Thuvander, M. (2024). Elemental distribution and fracture properties of magnetron sputtered carbon supersaturated tungsten films. Surface & Coatings Technology, 477, Article ID 130326.
Open this publication in new window or tab >>Elemental distribution and fracture properties of magnetron sputtered carbon supersaturated tungsten films
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2024 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 477, article id 130326Article in journal (Refereed) Published
Abstract [en]

The combination of strength and toughness is a major driving force for alloy design of protective coatings, and nanocrystalline tungsten (W)-alloys have shown to be promising candidates for combining strength and toughness. Here we investigate the elemental distribution and the fracture toughness of carbon (C) alloyed W thin films prepared by non-reactive magnetron sputtering. W:C films with up to ~4 at.% C crystallize in a body-centered-cubic structure with a strong 〈hh0〉texture, and no additional carbide phases are observed in the diffraction pattern. Atom probe tomography and X-ray photoelectron spectroscopy confirmed the formation of such a supersaturated solid solution. The pure W film has a hardness ~13 GPa and the W:C films exhibit a peak hardness of ~24 GPa. In-situ micromechanical cantilever bending tests show that the fracture toughness decreases from ~4.5 MPa·m1/2 for the W film to ~3.1 MPa·m1/2 for W:C films. The results show that C can significantly enhance the hardness of W thin films while retaining a high fracture toughness.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
PVD, Fracture toughness, Atom probe tomography, XPS, Tungsten
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-521828 (URN)10.1016/j.surfcoat.2023.130326 (DOI)001149676000001 ()
Funder
Swedish Foundation for Strategic Research, RMA15-0048
Available from: 2024-01-29 Created: 2024-01-29 Last updated: 2024-02-15Bibliographically approved
Dey, A., Silveira, V. R., Bericat Vadell, R., Lindblad, A., Lindblad, R., Shtender, V., . . . Sá, J. (2024). Exploiting hot electrons from a plasmon nanohybrid system for the photoelectroreduction of CO2. Communications Chemistry, 7(1), Article ID 59.
Open this publication in new window or tab >>Exploiting hot electrons from a plasmon nanohybrid system for the photoelectroreduction of CO2
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2024 (English)In: Communications Chemistry, E-ISSN 2399-3669, Vol. 7, no 1, article id 59Article in journal (Refereed) Published
Abstract [en]

Plasmonic materials convert light into hot carriers and heat to mediate catalytic transformation. The participation of hot carriers (photocatalysis) remains a subject of vigorous debate, often argued on the basis that carriers have ultrashort lifetime incompatible with drive photochemical processes. This study utilises plasmon hot electrons directly in the photoelectrocatalytic reduction of CO2 to CO via a Ppasmonic nanohybrid. Through the deliberate construction of a plasmonic nanohybrid system comprising NiO/Au/ReI(phen-NH2)(CO)3Cl (phen-NH2 = 1,10-Phenanthrolin-5-amine) that is unstable above 580 K; it was possible to demonstrate hot electrons are the main culprit in CO2 reduction. The engagement of hot electrons in the catalytic process is derived from many approaches that cover the processes in real-time, from ultrafast charge generation and separation to catalysis occurring on the minute scale. Unbiased in situ FTIR spectroscopy confirmed the stepwise reduction of the catalytic system. This, coupled with the low thermal stability of the ReI(phen-NH2)(CO)3Cl complex, explicitly establishes plasmonic hot carriers as the primary contributors to the process. Therefore, mediating catalytic reactions by plasmon hot carriers is feasible and holds promise for further exploration. Plasmonic nanohybrid systems can leverage plasmon’s unique photophysics and capabilities because they expedite the carrier’s lifetime.

Place, publisher, year, edition, pages
Springer Nature, 2024
National Category
Physical Chemistry Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-526189 (URN)10.1038/s42004-024-01149-8 (DOI)001190547400001 ()38509134 (PubMedID)
Funder
Olle Engkvists stiftelse, 210-0007Swedish Research Council, 2019-03597Knut and Alice Wallenberg Foundation, 2019-0071Uppsala UniversityWallenberg Foundations, WISE, LiU-2023-00139
Note

De två första författarna delar förstaförfattarskapet

Available from: 2024-04-05 Created: 2024-04-05 Last updated: 2024-04-05Bibliographically approved
Svensson, P., Schwob, L., Grånäs, O., Unger, I., Björneholm, O., Timneanu, N., . . . Berholts, M. (2024). Heavy element incorporation in nitroimidazole radiosensitizers: molecular-level insights into fragmentation dynamics. Physical Chemistry, Chemical Physics - PCCP, 26(2), 770-779
Open this publication in new window or tab >>Heavy element incorporation in nitroimidazole radiosensitizers: molecular-level insights into fragmentation dynamics
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2024 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 26, no 2, p. 770-779Article in journal (Refereed) Published
Abstract [en]

The present study investigates the photofragmentation behavior of iodine-enhanced nitroimidazole-based radiosensitizer model compounds in their protonated form using near-edge X-ray absorption mass spectrometry and quantum mechanical calculations. These molecules possess dual functionality: improved photoabsorption capabilities and the ability to generate species that are relevant to cancer sensitization upon photofragmentation. Four samples were investigated by scanning the generated fragments in the energy regions around C 1s, N 1s, O 1s, and I 3d-edges with a particular focus on NO2+ production. The experimental summed ion yield spectra are explained using the theoretical near-edge X-ray absorption fine structure spectrum based on density functional theory. Born-Oppenheimer-based molecular dynamics simulations were performed to investigate the fragmentation processes.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2024
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-522697 (URN)10.1039/d3cp03800a (DOI)001090175100001 ()37888897 (PubMedID)
Funder
Swedish Research Council, 2019-03935Swedish Research Council, 2017-05128Swedish Research Council, 2018-00740Swedish Foundation for Strategic ResearchSwedish National Infrastructure for Computing (SNIC), 2022/1-36Swedish National Infrastructure for Computing (SNIC), 2022/22-597
Available from: 2024-02-08 Created: 2024-02-08 Last updated: 2024-02-08Bibliographically approved
Heintz, M. C., Grins, J., Jaworski, A., Svensson, G., Thersleff, T., Brant, W. R., . . . Hernández, G. (2023). Photovoltaic Wafering Silicon Kerf Loss as Raw Material: Example of Negative Electrode for Lithium‐Ion Battery. ChemElectroChem, 10(19), Article ID e202300331.
Open this publication in new window or tab >>Photovoltaic Wafering Silicon Kerf Loss as Raw Material: Example of Negative Electrode for Lithium‐Ion Battery
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2023 (English)In: ChemElectroChem, E-ISSN 2196-0216, Vol. 10, no 19, article id e202300331Article in journal (Refereed) Published
Abstract [en]

Silicon powder kerf loss from diamond wire sawing in the photovoltaic wafering industry is a highly appealing source material for use in lithium-ion battery negative electrodes. Here, it is demonstrated for the first time that the kerf particles from three independent sources contain ~50 % amorphous silicon. The crystalline phase is in the shape of nano-scale crystalline inclusions in an amorphous matrix. From literature on wafering technology looking at wafer quality, the origin and mechanisms responsible for the amorphous content in the kerf loss powder are explained. In order to better understand for which applications the material could be a valuable raw material, the amorphicity and other relevant features are thoroughly investigated by a large amount of experimental methods. Furthermore, the kerf powder was crystallized and compared to the partly amorphous sample by operando X-ray powder diffraction experiments during battery cycling, demonstrating that the powders are relevant for further investigation and development for battery applications.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023
Keywords
amorphous materials, diamond wire sawing kerf, lithium-ion battery anode, secondary raw material, silicon
National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-517380 (URN)10.1002/celc.202300331 (DOI)001096405000011 ()
Funder
EU, Horizon 2020, 875568 COBRAStandUp
Available from: 2023-12-07 Created: 2023-12-07 Last updated: 2023-12-15Bibliographically approved
Öhman, S., Forslund, A., Lindblad, R., Nagy, G., Broqvist, P., Berggren, E., . . . Boman, M. (2023). Role of Oxygen in Vacancy-Induced Phase Formation and Crystallization of Al2TiO5-Based Chemical Vapor-Deposited Coatings. The Journal of Physical Chemistry C, 127(13), 6456-6465
Open this publication in new window or tab >>Role of Oxygen in Vacancy-Induced Phase Formation and Crystallization of Al2TiO5-Based Chemical Vapor-Deposited Coatings
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2023 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 127, no 13, p. 6456-6465Article in journal (Refereed) Published
Abstract [en]

Oxygen is a commonly overlooked element influencing the properties of many metal oxides. By combining several analytical in situ techniques and theoretical calculations, we demonstrate that oxygen plays a vital part in the phase formation and crystallization of Al2TiO5-based chemical vapor-deposited coatings. Rutherford backscattering spectrometry (RBS) corroborates a polymorphic transformation during crystallization. Subsequent hard X-ray photoelectron spectroscopy (HAXPES) shows that crystallization occurs through a displacive (diffusionless) mechanism. Coupled with theoretical calculations, the crystallization and co-formation of Al2TiO5, Al6Ti2O13, and Al16Ti5O34 are suggested to be driven by the migration of oxygen ions and their corresponding vacancies.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023
National Category
Condensed Matter Physics Materials Chemistry Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-502112 (URN)10.1021/acs.jpcc.2c08570 (DOI)000959751400001 ()
Funder
Swedish Foundation for Strategic Research, RMA15-0048Swedish Research Council, 2019-00191Swedish Research Council, 2020-06409eSSENCE - An eScience CollaborationSwedish National Infrastructure for Computing (SNIC)
Available from: 2023-05-25 Created: 2023-05-25 Last updated: 2024-06-05Bibliographically approved
Bericat Vadell, R., Sekar, P., Patehebieke, Y., Zou, X., Kaul, N., Broqvist, P., . . . Sá, J. (2023). Single-electron transfer reactions on surface-modified gold plasmons. Materials Today Chemistry, 34, Article ID 101783.
Open this publication in new window or tab >>Single-electron transfer reactions on surface-modified gold plasmons
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2023 (English)In: Materials Today Chemistry, E-ISSN 2468-5194, Vol. 34, article id 101783Article in journal (Refereed) Published
Abstract [en]

Photoredox catalysis's relevance in organic synthesis research and innovation will increase in the coming decades. However, the processes rely almost exclusively on expensive noble metal complexes, most notably iridium complexes, to absorb light and transfer a single charge to a substrate or a catalyst to initiate cascade transformations. Light-triggered plasmon resonances generate a non-Fermi-Dirac energy distribution with many hot carriers that decay in similar to 1 ps. Their ultrafast relaxation makes performing single electron transfer (SET) transformations challenging. Herein, a novel photosystem is proposed based on surface-modified gold nanoparticles (aka plasmon "molecularization"), which improved charge separation and, more importantly, enabled SET reactions, expanding the portfolio of photocatalysts available for photoredox catalysis. The photosystem was made into an electrode, permitting its use in photoelectrochemical arrangements that leverage electro- and photo-chemical approaches' benefits and chemical engineering solutions, helping the synthetic chemistry efforts towards greener synthesis and synthesis of more complex structures on a scale.

Place, publisher, year, edition, pages
Elsevier, 2023
National Category
Physical Chemistry Materials Chemistry
Research subject
Chemistry with specialization in Physical Chemistry; Chemistry with specialization in Physical Chemistry
Identifiers
urn:nbn:se:uu:diva-518008 (URN)10.1016/j.mtchem.2023.101783 (DOI)001109598500001 ()
Funder
Knut and Alice Wallenberg Foundation, 2019-0071Swedish Research Council, 2019-03597
Available from: 2023-12-15 Created: 2023-12-15 Last updated: 2024-02-12Bibliographically approved
Paschalidou, E.-M., Lindblad, R., Zendejas Medina, L., Karlsson, D., Jansson, U. & Nyholm, L. (2022). Corrosion studies on multicomponent CoCrFeMnNi(C) thin films in acidic environments. Electrochimica Acta, 404, Article ID 139756.
Open this publication in new window or tab >>Corrosion studies on multicomponent CoCrFeMnNi(C) thin films in acidic environments
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2022 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 404, article id 139756Article in journal (Refereed) Published
Abstract [en]

The corrosion resistances of near equimolar CoCrFeMnNi magnetron-sputtered thin films with different carbon concentrations were examined in 0.05 M HCl and 0.05 M H2SO4. Polarization curves were recorded with different scan rates with and without reducing the native oxide. The results showed that the carbon concentration and the experimental conditions affected the electrochemical behaviour mainly in the Cr transpassive region. At potentials above 850 mV, the carbon-containing films were more corrosion resistant in 0.05 M HCl than in 0.05 M H2SO4 due to a lower carbon oxidation rate in 0.05 M HCl, facilitating the formation of a Mn-rich oxide layer. (C)& nbsp;2021 The Author(s). Published by Elsevier Ltd.& nbsp;

Place, publisher, year, edition, pages
ElsevierElsevier BV, 2022
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-473954 (URN)10.1016/j.electacta.2021.139756 (DOI)000778816800008 ()
Funder
Swedish Research Council
Available from: 2022-05-06 Created: 2022-05-06 Last updated: 2024-01-15Bibliographically approved
Lindblad, R., Kjellsson, L., De Santis, E., Zamudio-Bayer, V., von Issendorff, B., Sorensen, S. L., . . . Couto, R. C. (2022). Experimental and theoretical near-edge x-ray-absorption fine-structure studies of NO+. Physical Review A: covering atomic, molecular, and optical physics and quantum information, 106(4), Article ID 042814.
Open this publication in new window or tab >>Experimental and theoretical near-edge x-ray-absorption fine-structure studies of NO+
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2022 (English)In: Physical Review A: covering atomic, molecular, and optical physics and quantum information, ISSN 2469-9926, E-ISSN 2469-9934, Vol. 106, no 4, article id 042814Article in journal (Refereed) Published
Abstract [en]

Experimental near-edge x-ray-absorption fine-structure (NEXAFS) spectra of the nitrosonium NO+ ion are presented and theoretically analyzed. While neutral NO has an open shell, the cation is a closed-shell species, which for NEXAFS leads to the simplicity of a closed-shell spectrum. Compared to neutral NO, the electrons in the cation experience a stronger Coulomb potential, which introduces a shift of the ionization potential towards higher energies, a depletion of intensity in a large interval above the pi* resonance, and a shift of the sigma* resonance from the continuum to below the ionization threshold. NEXAFS features at the nitrogen and oxygen K edges of NO+ are compared, as well as NEXAFS features at the nitrogen edges of the isoelectronic closed-shell species NO+, N2, and N2H+.

Place, publisher, year, edition, pages
American Physical Society, 2022
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-488287 (URN)10.1103/physreva.106.042814 (DOI)000879523600001 ()
Funder
Swedish Research Council, SNIC 2021/3-22Swedish Research Council, 637-2014-6929Swedish Research Council, 2014-04518EU, Horizon 2020, 730872
Available from: 2022-11-11 Created: 2022-11-11 Last updated: 2023-04-05Bibliographically approved
Delcey, M. G., Lindblad, R., Timm, M., Bülow, C., Zamudio-Bayer, V., von Issendorff, B., . . . Lundberg, M. (2022). Soft X-ray signatures of cationic manganese-oxo systems, including a high-spin manganese(v) complex. Physical Chemistry, Chemical Physics - PCCP, 24(6), 3598-3610
Open this publication in new window or tab >>Soft X-ray signatures of cationic manganese-oxo systems, including a high-spin manganese(v) complex
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2022 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 24, no 6, p. 3598-3610Article in journal (Refereed) Published
Abstract [en]

Manganese–oxo species catalyze key reactions, including C–H bond activation or dioxygen formation in natural photosynthesis. To better understand relevant reaction intermediates, we characterize electronic states and geometric structures of [MnOn]+ manganese–oxo complexes that represent a wide range of manganese oxidation states. To this end, we apply soft X-ray spectroscopy in a cryogenic ion trap, combined with multiconfigurational wavefunction calculations. We identify [MnO2]+ as a rare high-spin manganese(V) oxo complex with key similarities to six-coordinated manganese(V) oxo systems that are proposed as reaction intermediates in catalytic dioxygen bond formation.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2022
National Category
Theoretical Chemistry
Identifiers
urn:nbn:se:uu:diva-484301 (URN)10.1039/d1cp03667j (DOI)000750373600001 ()35103264 (PubMedID)
Funder
Knut and Alice Wallenberg Foundation, KAW-2013.0020Swedish Research Council, 637-2014-6929Swedish National Infrastructure for Computing (SNIC), 2019/3-586Swedish National Infrastructure for Computing (SNIC), 2020/5-643Olle Engkvists stiftelse, 183-0403
Available from: 2022-09-27 Created: 2022-09-27 Last updated: 2022-09-27Bibliographically approved
Villamayor, M. M., Husain, S., Oropesa-Nuñez, R., Johansson, F., Lindblad, R., Lourenco, P., . . . Nyberg, T. (2022). Wafer-sized WS2 monolayer deposition by sputtering. Nanoscale, 14(17), 6331-6338
Open this publication in new window or tab >>Wafer-sized WS2 monolayer deposition by sputtering
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2022 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 14, no 17, p. 6331-6338Article in journal (Refereed) Published
Abstract [en]

We demonstrate that tungsten disulphide (WS2) with thicknesses ranging from monolayer (ML) to several monolayers can be grown on SiO2/Si, Si, and Al2O3 by pulsed direct current-sputtering. The presence of high quality monolayer and multilayered WS2 on the substrates is confirmed by Raman spectroscopy since the peak separations between the A(1g)-E-2g and A(1g)-2LA vibration modes exhibit a gradual increase depending on the number of layers. X-ray diffraction confirms a textured (001) growth of WS2 films. The surface roughness measured with atomic force microscopy is between 1.5 and 3 angstrom for the ML films. The chemical composition WSx (x = 2.03 +/- 0.05) was determined from X-ray Photoelectron Spectroscopy. Transmission electron microscopy was performed on a multilayer film to show the 2D layered structure. A unique method for growing 2D layers directly by sputtering opens up the way for designing 2D materials and batch production of high-uniformity and high-quality (stochiometric, large grain sizes, flatness) WS2 films, which will advance their practical applications in various fields.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2022
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-484453 (URN)10.1039/d1nr08375a (DOI)000770085100001 ()35297938 (PubMedID)
Funder
Swedish Research Council, 2017-06816Swedish Research Council, 2014-6463Swedish Research Council, 2018-05336
Available from: 2022-09-15 Created: 2022-09-15 Last updated: 2022-09-15Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6162-1167

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