Preventing sintering of Au and Ag nanoparticles in silica-based hybrid gels using phenyl spacer groups

被引：31

作者：

Wichner, Nina M. ^{[2
]}

Beckers, Jurriaan ^{[1
]}

Rothenberg, Gadi ^{[1
]}

Koller, Hubert ^{[2
]}

机构：

[1] Univ Amsterdam, Vant Hoff Inst Mol Sci, NL-1018 WV Amsterdam, Netherlands

[2] Univ Munster, Inst Phys Chem, D-48149 Munster, Germany

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2010年 / 20卷 / 19期

关键词：

CO OXIDATION; DRUG-RELEASE; DESIGN; SIZE; PRECURSORS; CHEMISTRY; CATALYSTS;

D O I：

10.1039/c000105h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Gold and silver metal salts were reduced in the presence of phenylethylthiol as capping agent to form metal nanoparticles of 2.1-2.4 nm diameter. These clusters were then added to a sol-gel process using phenyltriethoxysilane as a hybrid component to optimize the dispersion of the metal particles in the matrix. The encapsulated metal particles grow in the sol-gel process to an average diameter of 6 nm. This method permits a controlled variation of the materials' porosity by simply regulating the synthesis pH values. Optimized mixed micro-/mesoporous materials are obtained at pH = 6. The metal particles and the matrix are thermally stable, and catalyze CO oxidation.

引用

页码：3840 / 3847

页数：8

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