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Issue 30, 2016
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Asymmetric silica encapsulation toward colloidal Janus nanoparticles: a concave nanoreactor for template-synthesis of an electocatalytic hollow Pt nanodendrite

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Abstract

A novel reverse microemulsion strategy was developed to asymmetrically encapsulate metal–oxide nanoparticles in silica by exploiting the self-catalytic growth of aminosilane-containing silica at a single surface site. This strategy produced various colloidal Janus nanoparticles, including Au/Fe3O4@asy-SiO2, which were converted to an Au-containing silica nanosphere, Au@con-SiO2, by reductive Fe3O4 dissolution. The use of Au@con-SiO2 as a metal-growing nanoreactor allowed the templated synthesis of various noble-metal nanocrystals, including a hollow dendritic Pt nanoshell which exhibits significantly better electrocatalytic activities for the oxygen reduction reaction than commercial Pt/C catalysts.

Graphical abstract: Asymmetric silica encapsulation toward colloidal Janus nanoparticles: a concave nanoreactor for template-synthesis of an electocatalytic hollow Pt nanodendrite

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Supplementary files

Article information


Submitted
02 May 2016
Accepted
09 Jul 2016
First published
19 Jul 2016

Nanoscale, 2016,8, 14593-14599
Article type
Paper

Asymmetric silica encapsulation toward colloidal Janus nanoparticles: a concave nanoreactor for template-synthesis of an electocatalytic hollow Pt nanodendrite

J. H. Koo, D. Kim, J. G. Kim, H. Jeong, J. Kim and I. S. Lee, Nanoscale, 2016, 8, 14593
DOI: 10.1039/C6NR03557D

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