|
|||||
|
|
Imaging gold clusters on TiO2(110) at elevated pressures and temperatures |
|
| Authors: | A. Kolmakov D.W. Goodman |
| Affiliation: | (1) Department of Chemistry, Texas A&M University, PO Box 30012, College Station, TX 77842-3012, USA;(2) Department of Chemistry, Texas A&M University, PO Box 30012, College Station, TX 77842-3012, USA |
| Abstract: | Variable temperature scanning tunneling microscopy (STM) has been used to image oxide-supported nanoclusters of Au at temperatures from 300 to 450 K and oxygen pressures from 10–10 to 4 Torr. Oxygen-induced morphological changes of the TiO2(1×2) reconstruction are apparent at room temperature and prolonged exposure ( 3×103 L (langmuir)) at 10–4 Torr oxygen. Gold clusters with diameters smaller than 4 nm are unstable toward sintering at ca. 450 K and oxygen pressures >10–1 Torr. Oxygen at pressures >10–4 Torr weakens the interaction between the gold cluster and the titania support. Increasing the sample temperature to >300 K facilitates disruption of the cluster–support interaction. |
| Keywords: | scanning tunneling microscopy elevated pressures and temperatures TiO2 Au clusters catalysts |
| 本文献已被 SpringerLink 等数据库收录！ | |