Organosilane-assisted transformation from core-shell to yolk-shell nanocomposites

Yang, Yan, Liu, Jian, Li, Xiaobo, Liu, Xiao and Yang, Qihua Yang (2011) Organosilane-assisted transformation from core-shell to yolk-shell nanocomposites. Chemistry of Materials, 23 16: 3676-3684. doi:10.1021/cm201182d

Author Yang, Yan
Liu, Jian
Li, Xiaobo
Liu, Xiao
Yang, Qihua Yang
Title Organosilane-assisted transformation from core-shell to yolk-shell nanocomposites
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1021/cm201182d
Volume 23
Issue 16
Start page 3676
End page 3684
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2012
Language eng
Formatted abstract
In this paper, we present the synthesis of yolk–shell nanocomposites (NCs) with moveable cores (Fe3O4, Au nanoparticles (NPs)) and functionalized organosilica mesoporous shells by an organosilane-assisted etching approach for the first time. This synthesis method is facile, general, and rapid. By adding organosilanes such as 1,2-bis(trimethoxysilyl)ethane (BTME) and 1,4-bis(triethoxysilyl)benzene (BTEB) into the synthetic medium of NPs@silica (Fe3O4 and Au NPs) core–shell NCs, the organosilica species deposit on the surface of the core–shell NCs, while the initial silica shells can be subsequently dissolved to form the yolk–shell NCs. The formation of such yolk–shell NCs can be reasonably explained by a novel organosilane-assisted etching mechanism based on the results of FT-IR and 29Si NMR spectroscopy. The yolk–shell NCs with Au cores exhibit much higher catalytic activity than the Au@silica core–shell NCs for the catalytic reduction of o-nitroaniline, probably due to the higher accessibility of the Au active sites in the yolk–shell NCs.
Keyword Moveable cores
Mesoporous shells
One-pot method
Organosilane-assisted etching mechanism
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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