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Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study
A combined high resolution X-ray photoelectron spectroscopy and X-ray standing wave study into the adsorption structure of hydrogenated graphene on Ir(111) is presented. By exploiting the unique absorption profiles and significant modulations in signal intensity found within the X-ray standing wave...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9409641/ https://www.ncbi.nlm.nih.gov/pubmed/35514290 http://dx.doi.org/10.1039/d1fd00122a |
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author | Kastorp, Claus F. P. Duncan, David A. Jørgensen, Anders L. Scheffler, Martha Thrower, John D. Lee, Tien-Lin Hornekær, Liv Balog, Richard |
author_facet | Kastorp, Claus F. P. Duncan, David A. Jørgensen, Anders L. Scheffler, Martha Thrower, John D. Lee, Tien-Lin Hornekær, Liv Balog, Richard |
author_sort | Kastorp, Claus F. P. |
collection | PubMed |
description | A combined high resolution X-ray photoelectron spectroscopy and X-ray standing wave study into the adsorption structure of hydrogenated graphene on Ir(111) is presented. By exploiting the unique absorption profiles and significant modulations in signal intensity found within the X-ray standing wave results, we refine the fitting of the C 1s X-ray photoelectron spectra, allowing us to disentangle the contributions from hydrogenation of graphene in different high-symmetry regions of the moiré supercell. We clearly demonstrate that hydrogenation in the FCC regions results in the formation of a graphane-like structure, giving a standalone component that is separated from the component assigned to the similar structure in the HCP regions. The contribution from dimer structures in the ATOP regions is found to be minor or negligible. This is in contrast to the previous findings where a dimer structure was assumed to contribute significantly to the sp(3) part of the C 1s spectra. The corrugation of the remaining pristine parts of the H-graphene is shown to increase with the H coverage, reflecting an increasing number and size of pinning centers of the graphene to the Ir(111) substrate with increasing H exposure. |
format | Online Article Text |
id | pubmed-9409641 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-94096412022-09-19 Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study Kastorp, Claus F. P. Duncan, David A. Jørgensen, Anders L. Scheffler, Martha Thrower, John D. Lee, Tien-Lin Hornekær, Liv Balog, Richard Faraday Discuss Chemistry A combined high resolution X-ray photoelectron spectroscopy and X-ray standing wave study into the adsorption structure of hydrogenated graphene on Ir(111) is presented. By exploiting the unique absorption profiles and significant modulations in signal intensity found within the X-ray standing wave results, we refine the fitting of the C 1s X-ray photoelectron spectra, allowing us to disentangle the contributions from hydrogenation of graphene in different high-symmetry regions of the moiré supercell. We clearly demonstrate that hydrogenation in the FCC regions results in the formation of a graphane-like structure, giving a standalone component that is separated from the component assigned to the similar structure in the HCP regions. The contribution from dimer structures in the ATOP regions is found to be minor or negligible. This is in contrast to the previous findings where a dimer structure was assumed to contribute significantly to the sp(3) part of the C 1s spectra. The corrugation of the remaining pristine parts of the H-graphene is shown to increase with the H coverage, reflecting an increasing number and size of pinning centers of the graphene to the Ir(111) substrate with increasing H exposure. The Royal Society of Chemistry 2022-05-06 /pmc/articles/PMC9409641/ /pubmed/35514290 http://dx.doi.org/10.1039/d1fd00122a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Kastorp, Claus F. P. Duncan, David A. Jørgensen, Anders L. Scheffler, Martha Thrower, John D. Lee, Tien-Lin Hornekær, Liv Balog, Richard Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title | Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title_full | Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title_fullStr | Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title_full_unstemmed | Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title_short | Selective hydrogenation of graphene on Ir(111): an X-ray standing wave study |
title_sort | selective hydrogenation of graphene on ir(111): an x-ray standing wave study |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9409641/ https://www.ncbi.nlm.nih.gov/pubmed/35514290 http://dx.doi.org/10.1039/d1fd00122a |
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