Uniform hierarchical tetradecahedral SnO2/Zn2SnO4 composites for ultrafast response/recovery and selective gas detection at room temperature

摘要

In this work, hierarchical tetradecahedral SnO2/Zn2SnO4 composites were synthesized by a simple one-pot method without using surfactants and templates and have a uniform diameter of similar to 1 mu m. Importantly, SnO2/Zn(2)SnO(4 )was used to manufacture gas sensor. After testing the sensor, it displays good selectivity to ethanol and excellent repeatability at room temperature (RT). It has ultra-fast response/recovery times with 9 s and 7 s at 200 ppm ethanol, respectively. Such enhanced gas-sensing performances are probably ascribed to the unique hierarchical tetradecahedral SnO2/Zn2SnO4 structure, the strong interfacial interaction and the existence of heterojunctions between Zn2SnO4 and SnO2.