Oxidation-resistant gold-55 clusters |
| |
Authors: | Boyen H-G Kästle G Weigl F Koslowski B Dietrich C Ziemann P Spatz J P Riethmüller S Hartmann C Möller M Schmid G Garnier M G Oelhafen P |
| |
Institution: | Abteilung Festk?rperphysik, Abteilung Organische Chemie III, Universit?t Ulm, D-89069 Ulm, Germany. hans-gerd.boyen@physik.uni-ulm.de |
| |
Abstract: | Gold nanoparticles ranging in diameter from 1 to 8 nanometers were prepared on top of silicon wafers in order to study the size dependence of their oxidation behavior when exposed to atomic oxygen. X-ray photoelectron spectroscopy showed a maximum oxidation resistance for "magic-number" clusters containing 55 gold atoms. This inertness is not related to electron confinement leading to a size-induced metal-to-insulator transition, but rather seems to be linked to the closed-shell structure of such magic clusters. The result additionally suggests that gold-55 clusters may act as especially effective oxidation catalysts, such as for oxidizing carbon monoxide. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|