Gas sensor technology has been developed remarkably in recent years due to its wide applications in modern society. To meet the demand of low-level detection, gas sensor is still required to minimize the size in order to match the uses in micro-/nano- devices. This article reviews the development of nano SnO2 gas sensors to H2, CO, NO2, and ethanol gas/vapour. The emphasis has been put upon the material preparations, sensing mechanisms and properties based on different kinds of SnO2 nanostructures (e.g. nanoparticles, nanowires & nanofibers, nanobelts & nanoribbons, and nanorods & nanocolumns). It is demonstrated that very high sensitivity and selectivity as well as fast response can be achieved when the n-type semiconductor SnO2 is in the form of nanostructures.
Keywords: SnO2, doped SnO2, Nanomaterials, Gas sensors, low-level detection, micro-/nano- devices, nanoparticles, nanowires, nanofibers, nanobelts, nanoribbons, nanorods, nanocolumns, n-type semiconductor, pellet-based sensors, multiwall carbon nanotubes (MWCNTs), Sb-doped, NRBs, nonyl phenol ether (NP5), core-shell nanostructures
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