Curcio, D;
Sierda, E;
Pozzo, M;
Bignardi, L;
Sbuelz, L;
Lacovig, P;
Lizzit, S;
... Baraldi, A; + view all
(2020)
Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111).
Chemical Science
10.1039/d0sc03734f.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Unusual reversibility in molecular break-up of PAHs: the case of pentacene dehydrogenation on Ir(111) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d0sc03734f |
| Publisher version: | https://doi.org/10.1039/d0sc03734f |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (https://creativecommons.org/licenses/by-nc/3.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10115157 |
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