Highly efficient ethanol gas sensor based on hierarchical SnO2/Zn2SnO4 porous spheres

•The SnO2/Zn2SnO4 porous spheres were synthesized via a facile one-step hydrothermal method.•The porous SnO2/Zn2SnO4 spheres exhibited excellent ethanol gas sensing property.•The porous SnO2/Zn2SnO4 spheres possess a low detection limit of 500 ppb.•The sensor based on porous SnO2/Zn2SnO4 spheres exh...

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Veröffentlicht in:Sensors and actuators. B, Chemical Chemical, 2019-03, Vol.282, p.339-346
Hauptverfasser: Yang, Xueli, Li, Hao, Li, Tai, Li, Zezheng, Wu, Weifeng, Zhou, Chaoge, Sun, Peng, Liu, Fangmeng, Yan, Xu, Gao, Yuan, Liang, Xishuang, Lu, Geyu
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Sprache:eng
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Zusammenfassung:•The SnO2/Zn2SnO4 porous spheres were synthesized via a facile one-step hydrothermal method.•The porous SnO2/Zn2SnO4 spheres exhibited excellent ethanol gas sensing property.•The porous SnO2/Zn2SnO4 spheres possess a low detection limit of 500 ppb.•The sensor based on porous SnO2/Zn2SnO4 spheres exhibited a rapid response time of 2 s. In this work, hierarchucal porous SnO2/Zn2SnO4 nanospheres were succesfully prepared via a facile one-step hydrothermal method with subsequent calcination process. Scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed in order to investigate the structural and morphological properties of the as-prepared composites. The results showed that the SnO2/Zn2SnO4 composites were cpmposed of many porous nanospheres with a uniform diameter of about 500 nm. Moreover, the as-prepared products were used as sensing material for the fabrication of gas sensor. The sensing performance of the sensor was systematically evaluated, and the sensor exhibited excellent ethanol-sensing property. The optimum operating temperature was 250 °C with a reponse of 30.5 toward 100 ppm ethanol. Also, the sensor showed good selectivity, stability and a low detection limit of 0.5 ppm (response 1.4). The good sensing performance of SnO2/Zn2SnO4 nanospheres can be attibuted to the porous structure as well as the heterojunction formed between SnO2 and ZnSn2O4.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2018.11.070