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Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111)
In this work, we characterize the adsorption of pentacene molecules on Ir(111) and their behaviour as a function of temperature. While room temperature adsorption preserves the molecular structure of the five benzene rings and the bonds between carbon and hydrogen atoms, we find that complete C–H mo...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8179676/ https://www.ncbi.nlm.nih.gov/pubmed/34168740 http://dx.doi.org/10.1039/d0sc03734f |
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author | Curcio, Davide Sierda, Emil Pozzo, Monica Bignardi, Luca Sbuelz, Luca Lacovig, Paolo Lizzit, Silvano Alfè, Dario Baraldi, Alessandro |
author_facet | Curcio, Davide Sierda, Emil Pozzo, Monica Bignardi, Luca Sbuelz, Luca Lacovig, Paolo Lizzit, Silvano Alfè, Dario Baraldi, Alessandro |
author_sort | Curcio, Davide |
collection | PubMed |
description | In this work, we characterize the adsorption of pentacene molecules on Ir(111) and their behaviour as a function of temperature. While room temperature adsorption preserves the molecular structure of the five benzene rings and the bonds between carbon and hydrogen atoms, we find that complete C–H molecular break up takes place between 450 K and 550 K, eventually resulting in the formation of small graphene islands at temperatures larger than 800 K. Most importantly a reversible temperature-induced dehydrogenation process is found when the system is annealed/cooled in a hydrogen atmosphere with a pressure higher than 5 × 10(−7) mbar. This novel process could have interesting implications for the synthesis of larger acenes and for the manipulation of graphene nanoribbon properties. |
format | Online Article Text |
id | pubmed-8179676 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-81796762021-06-23 Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) Curcio, Davide Sierda, Emil Pozzo, Monica Bignardi, Luca Sbuelz, Luca Lacovig, Paolo Lizzit, Silvano Alfè, Dario Baraldi, Alessandro Chem Sci Chemistry In this work, we characterize the adsorption of pentacene molecules on Ir(111) and their behaviour as a function of temperature. While room temperature adsorption preserves the molecular structure of the five benzene rings and the bonds between carbon and hydrogen atoms, we find that complete C–H molecular break up takes place between 450 K and 550 K, eventually resulting in the formation of small graphene islands at temperatures larger than 800 K. Most importantly a reversible temperature-induced dehydrogenation process is found when the system is annealed/cooled in a hydrogen atmosphere with a pressure higher than 5 × 10(−7) mbar. This novel process could have interesting implications for the synthesis of larger acenes and for the manipulation of graphene nanoribbon properties. The Royal Society of Chemistry 2020-11-03 /pmc/articles/PMC8179676/ /pubmed/34168740 http://dx.doi.org/10.1039/d0sc03734f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Curcio, Davide Sierda, Emil Pozzo, Monica Bignardi, Luca Sbuelz, Luca Lacovig, Paolo Lizzit, Silvano Alfè, Dario Baraldi, Alessandro Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title_full | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title_fullStr | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title_full_unstemmed | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title_short | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
title_sort | unusual reversibility in molecular break-up of pahs: the case of pentacene dehydrogenation on ir(111) |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8179676/ https://www.ncbi.nlm.nih.gov/pubmed/34168740 http://dx.doi.org/10.1039/d0sc03734f |
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