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Spin-Polarized Photoemission from Chiral CuO Catalyst Thin Films
[Image: see text] The chirality-induced spin selectivity (CISS) effect facilitates a paradigm shift for controlling the outcome and efficiency of spin-dependent chemical reactions, for example, photoinduced water splitting. While the phenomenon is established in organic chiral molecules, its emergen...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413420/ https://www.ncbi.nlm.nih.gov/pubmed/35943911 http://dx.doi.org/10.1021/acsnano.2c02709 |
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author | Möllers, Paul V. Wei, Jimeng Salamon, Soma Bartsch, Manfred Wende, Heiko Waldeck, David H. Zacharias, Helmut |
author_facet | Möllers, Paul V. Wei, Jimeng Salamon, Soma Bartsch, Manfred Wende, Heiko Waldeck, David H. Zacharias, Helmut |
author_sort | Möllers, Paul V. |
collection | PubMed |
description | [Image: see text] The chirality-induced spin selectivity (CISS) effect facilitates a paradigm shift for controlling the outcome and efficiency of spin-dependent chemical reactions, for example, photoinduced water splitting. While the phenomenon is established in organic chiral molecules, its emergence in chiral but inorganic, nonmolecular materials is not yet understood. Nevertheless, inorganic spin-filtering materials offer favorable characteristics, such as thermal and chemical stability, over organic, molecular spin filters. Chiral cupric oxide (CuO) thin films can spin polarize (photo)electron currents, and this capability is linked to the occurrence of the CISS effect. In the present work, chiral CuO films, electrochemically deposited on partially UV-transparent polycrystalline gold substrates, were subjected to deep-UV laser pulses, and the average spin polarization of photoelectrons was measured in a Mott scattering apparatus. By energy resolving the photoelectrons and changing the photoexcitation geometry, the energy distribution and spin polarization of the photoelectrons originating from the Au substrate could be distinguished from those arising from the CuO film. The findings reveal that the spin polarization is energy dependent and, furthermore, indicate that the measured polarization values can be rationalized as a sum of an intrinsic spin polarization in the chiral oxide layer and a contribution via CISS-related spin filtering of electrons from the Au substrate. The results support efforts toward a rational design of further spin-selective catalytic oxide materials. |
format | Online Article Text |
id | pubmed-9413420 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-94134202022-08-27 Spin-Polarized Photoemission from Chiral CuO Catalyst Thin Films Möllers, Paul V. Wei, Jimeng Salamon, Soma Bartsch, Manfred Wende, Heiko Waldeck, David H. Zacharias, Helmut ACS Nano [Image: see text] The chirality-induced spin selectivity (CISS) effect facilitates a paradigm shift for controlling the outcome and efficiency of spin-dependent chemical reactions, for example, photoinduced water splitting. While the phenomenon is established in organic chiral molecules, its emergence in chiral but inorganic, nonmolecular materials is not yet understood. Nevertheless, inorganic spin-filtering materials offer favorable characteristics, such as thermal and chemical stability, over organic, molecular spin filters. Chiral cupric oxide (CuO) thin films can spin polarize (photo)electron currents, and this capability is linked to the occurrence of the CISS effect. In the present work, chiral CuO films, electrochemically deposited on partially UV-transparent polycrystalline gold substrates, were subjected to deep-UV laser pulses, and the average spin polarization of photoelectrons was measured in a Mott scattering apparatus. By energy resolving the photoelectrons and changing the photoexcitation geometry, the energy distribution and spin polarization of the photoelectrons originating from the Au substrate could be distinguished from those arising from the CuO film. The findings reveal that the spin polarization is energy dependent and, furthermore, indicate that the measured polarization values can be rationalized as a sum of an intrinsic spin polarization in the chiral oxide layer and a contribution via CISS-related spin filtering of electrons from the Au substrate. The results support efforts toward a rational design of further spin-selective catalytic oxide materials. American Chemical Society 2022-08-09 2022-08-23 /pmc/articles/PMC9413420/ /pubmed/35943911 http://dx.doi.org/10.1021/acsnano.2c02709 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Möllers, Paul V. Wei, Jimeng Salamon, Soma Bartsch, Manfred Wende, Heiko Waldeck, David H. Zacharias, Helmut Spin-Polarized Photoemission from Chiral CuO Catalyst Thin Films |
title | Spin-Polarized Photoemission
from Chiral CuO Catalyst
Thin Films |
title_full | Spin-Polarized Photoemission
from Chiral CuO Catalyst
Thin Films |
title_fullStr | Spin-Polarized Photoemission
from Chiral CuO Catalyst
Thin Films |
title_full_unstemmed | Spin-Polarized Photoemission
from Chiral CuO Catalyst
Thin Films |
title_short | Spin-Polarized Photoemission
from Chiral CuO Catalyst
Thin Films |
title_sort | spin-polarized photoemission
from chiral cuo catalyst
thin films |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413420/ https://www.ncbi.nlm.nih.gov/pubmed/35943911 http://dx.doi.org/10.1021/acsnano.2c02709 |
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