期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 33, 页码 19238-19245出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp506187d
关键词
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资金
- National Basic Research Program of China [2013CB933104]
- National Natural Science Foundation of China [U1332113, 21173204]
Oxide-on-metal particles with exposed interfaces exhibit wealthy structures and functions, but their facile synthesis remains as a challenge. Herein we report a facile O-2-assisted hydrothermal method to synthesize CeO2-on-Ag particles with different CeO2 thicknesses. In this novel approach Ag particles catalyze the O-2 + H2O reaction to form surface hydroxyls that induce the preferential nucleation of Ce(OH)(3) on the surfaces of Ag particles, eventually forming CeO2 adlayers on Ag particles. CeO2-on-Ag particles exhibit the CeO2 thickness-dependent SERS effect in which their best SERS effect is 2 orders stronger than that of Ag particles. They also exhibit CeO2 thickness-dependent catalytic performance in CO oxidation in which the best one is as active as traditional CeO2-supported Ag catalyst. These results open up new opportunities to synthesize oxide-on-metal particles and explore their functions by tuning the oxide adlayer thickness.
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