Journal
NANO RESEARCH
Volume 2, Issue 12, Pages 975-983Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-009-9102-z
Keywords
Gold nanocatalysts; support effect; CO oxidation; Au-Fe3O4; dumbbell nanoparticles
Categories
Funding
- National Natural Science Foundation of China [20871100, 20721001]
- Distinguished Young Investigator Grant [20925103]
- Research Fund for the Doctoral Program of Higher Education of China [200803841010]
- Natural Science Foundation of Fujian [2009J06005]
- Key Scientific Project of Fujian Province [2009HZ0002-1]
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Au nanoparticles epitaxially grown on Fe3O4 in Au (6.7 nm)-Fe3O4 dumbbell nanoparticles exhibit excellent stability against sintering, but display negligible catalytic activity in CO oxidation. Starting from various supported Au (6.7 nm)-Fe3O4 catalysts prepared by the colloidal deposition method, we have unambiguously identified the significance of the Au-TiO2 interface in CO oxidation, without any possible size effect of Au. In situ thermal decomposition of TiO2 precursors on Au-Fe3O4 was found to be an effective way to increase the Au-TiO2 interface and thereby optimize the catalytic performance of TiO2-supported Au-Fe3O4 dumbbell nanoparticles. By reducing the size of Fe3O4 from 15.2 to 4.9 nm, the Au-TiO2 contact was further increased so that the resulting TiO2-supported Au (6.7 nm)-Fe3O4 (4.9 nm) dumbbell particles become highly efficient catalysts for CO oxidation at room temperature.
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