Efficient photogeneration of nonacene on nanostructured graphene
| Autor: | Rodolfo Miranda, Hiroko Yamada, Cosme G. Ayani, Roman Fasel, Fernando Martín, Amadeo L. Vázquez de Parga, Cristina Díaz, Juan Jesús Navarro, M. Pisarra, F. Calleja, José I. Urgel, Hironobu Hayashi |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Graphene 02 engineering and technology Inelastic scattering 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Electron transfer Adsorption Chemical physics law Yield (chemistry) General Materials Science Scanning tunneling microscope 0210 nano-technology Spectroscopy Surface states |
| Zdroj: | Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia instname |
| ISSN: | 2055-6764 |
| Popis: | The on-surface photogeneration of nonacene from α-bisdiketone precursors deposited on nanostructured epitaxial graphene grown on Ru(0001) has been studied by means of low temperature scanning tunneling microscopy and spectroscopy. The presence of an unoccupied surface state, spatially localized in the regions where the precursors are adsorbed, and energetically accessible in the region of the electromagnetic spectrum where n–π* transitions take place, allows for a 100% conversion of the precursors into nonacenes. With the help of state-of-the-art theoretical calculations, we show that such a high yield is due to the effective population of the surface state by the incoming light and the ensuing electron transfer to the unoccupied states of the precursors through an inelastic scattering mechanism. Our findings are the experimental confirmation that surface states can play a prominent role in the surface photochemistry of complex molecular systems, in accordance with early theoretical predictions made on small molecules. |
| Databáze: | OpenAIRE |
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