| Autor: |
Andrew Mellor, Gianfranco Pacchioni, Philomena Schlexer Lamoureux, Chi Ming Yim, Geoff Thornton, Hicham Idriss, Chi L. Pang |
| Přispěvatelé: |
Yim, C, Lamoureux, P, Mellor, A, Pang, C, Idriss, H, Pacchioni, G, Thornton, G |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
The Journal of Physical Chemistry Letters. 12:8363-8369 |
| ISSN: |
1948-7185 |
| Popis: |
Understanding the mechanism behind the superior catalytic power of single- or few-atom heterogeneous catalysts has become an important topic in surface chemistry. This is particularly the case for gold, with TiO2 being an efficient support. Here we use scanning tunneling microscopy/spectroscopy with theoretical calculations to investigate the adsorption geometry and local electronic structure of several-atom Au clusters on rutile TiO2(110), with the clusters fabricated by controlled manipulation of single atoms. Our study confirms that Au1 and Au2 clusters prefer adsorption at surface O vacancies. Au3 clusters adsorb at O vacancies in a linear-chain configuration parallel to the surface; in the absence of O vacancies they adsorb at Ti5c sites with a structure of a vertically pointing upright triangle. We find that both the electronic structure and cluster-substrate charge transfer depend critically on the cluster size, bonding configuration, and local environment. This suggests the possibility of engineering cluster selectivity for specific catalytic reactions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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