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

作者: Lili Wang ,Huimin Dou ,Zheng Lou ,Tong Zhang ,
期刊: Nanoscale
卷号: 2013,5,2686-2691
接收日期: 2012-11-29 16:12:34
摘要 Abstract

New Au@SnO2 yolk?Cshell nanospheres have been successfully synthesized by using Au@SiO2 nanospheres as sacrificial templates. This process is environmentally friendly and is based on hydrothermal shell-by-shell deposition of polycrystalline SnO2 on spheriform Au@SiO2nanotemplates. Au nanoparticles can be impregnated into the SnO2nanospheres 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@SnO2 yolk?Cshell nanospheres were researched and compared with that of the hollow SnO2 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@SnO2 yolk?Cshell nanospheres.

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