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Synthesis and catalytic performance of multiple gold nanodots core–mesoporous silica shell nanoparticles

Authors
Journal
Microporous and Mesoporous Materials
1387-1811
Publisher
Elsevier
Publication Date
Volume
185
Identifiers
DOI: 10.1016/j.micromeso.2013.11.003
Keywords
  • Multi Gold Core
  • Mesoporous Silica Shell
  • Soft-Etching
  • Catalytic Reduction
  • York-Shell Nanoparticle

Abstract

Abstract Multiple gold (Au) nanodots core–mesoporous silica shell nanoparticles ([email protected] NPs) were successfully synthesized in solution through a soft-etching methodology. Thermal treatment of the [email protected] NPs in water without adding any other additives lead to generation of mesopores over the silica shell without any change in the size and number of the Au nanodots. The [email protected] NPs showed much higher catalytic activity in the reduction of 4-aminophenol than [email protected] NPs and other single Au nanodot core–silica shell nanoparticles with york-shell morphologies, which were also effectively fabricated ([email protected] NPs and [email protected] NPs). The enhanced catalytic activity is mainly due to the efficient diffusion of reactants onto the multiple Au nanodots through mesopores within the silica shell as well as the higher surface area of multiple Au nanodots.

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