Encapsuled nanoreactors (Au@SnO2): a new sensing material for chemical sensors

New Au@SnO 2 yolk-shell nanospheres have been successfully synthesized by using Au@SiO 2 nanospheres as sacrificial templates. This process is environmentally friendly and is based on hydrothermal shell-by-shell deposition of polycrystalline SnO 2 on spheriform Au@SiO 2 nanotemplates. Au nanoparticl...

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Bibliographic Details
Published in:Nanoscale 2013-01, Vol.5 (7), p.2686-2691
Main Authors: Wang, Lili, Dou, Huimin, Lou, Zheng, Zhang, Tong
Format: Article
Language:English
Subjects:
Biosensing Techniques
Detection
Gases - analysis
Gold
Gold Compounds - chemistry
Metal Nanoparticles - chemistry
Metal Nanoparticles - ultrastructure
Microelectrodes
Nanocomposites
Nanomaterials
Nanospheres
Nanospheres - chemistry
Nanospheres - ultrastructure
Nanostructure
Silicon Dioxide - chemistry
Surface Properties
Temperature
Tin Compounds - chemistry
Tin dioxide
Tin oxides
X-Ray Diffraction
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Summary:New Au@SnO 2 yolk-shell nanospheres have been successfully synthesized by using Au@SiO 2 nanospheres as sacrificial templates. This process is environmentally friendly and is based on hydrothermal shell-by-shell deposition of polycrystalline SnO 2 on spheriform Au@SiO 2 nanotemplates. Au nanoparticles can be impregnated into the SnO 2 nanospheres and the nanospheres show outer diameters of 110 nm and thicknesses of 15 nm. The possible growth model of the nanospheres is proposed. The gas sensing properties of the Au@SnO 2 yolk-shell nanospheres were researched and compared with that of the hollow SnO 2 nanospheres. The former shows lower operating temperature (210 °C), lower detection limit (5 ppm), faster response (0.3 s) and better selectivity. These improved sensing properties were attributed to the catalytic effect of Au, and enhanced electron depletion at the surface of the Au@SnO 2 yolk-shell nanospheres. Novel yolk-shell hollow spheres exhibited low detection limit and rapid response and recovery to CO.
ISSN:2040-3364
2040-3372
DOI:10.1039/c2nr33088a