Issue 19, 2010

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

Abstract

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
06 Jan 2010
Accepted
12 Mar 2010
First published
13 Apr 2010
This article is Open Access

J. Mater. Chem., 2010,20, 3840-3847

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

N. M. Wichner, J. Beckers, G. Rothenberg and H. Koller, J. Mater. Chem., 2010, 20, 3840 DOI: 10.1039/C000105H

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