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Gold nanoparticles confined in vertically aligned silica nanochannels and their electrocatalytic activity toward
Longhua Ding1, Wanzhen Li, Qinqin Sun
1Institute of Microanalytical Systems, Department of Chemistry, Zhejiang University, Hangzhou 310058 (P.R. China), Fax: (+86) 571-88273572.
Abstract:
A facile method of confining gold nanoparticles (AuNPs) in silica nanochannels aligned perpendicularly to an underlying electrode surface is reported. The nanochannel surface carrying a layer of (3-aminopropyl)triethoxy silane (APTS) displays a strong electrostatic interaction with AuCl4(-), eventually resulting in the confinement of AuNPs inside the nanochannels after chemical reduction. As-prepared AuNPs in APTS-modified mesoporous silica film (APTS-MSF) are highly dispersed with a narrow size distribution. Furthermore, these AuNPs are free of protecting ligands and exhibit a good electrochemical catalytic activity toward the oxidation of ascorbic acid.
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