Low-temperature in-situ growth of SnO2 nanosheets and its high triethylamine sensing response by constructing Au-loaded ZnO/SnO2 heterostructure

• Published in: Journal of alloys and compounds Vol. 737; pp. 603 - 612
• Main Authors: Zhai, Ting, Xu, Hongyan, Li, Wenru, Yu, Huanqin, Chen, Zhengrun, Wang, Jieqiang, Cao, Bingqiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.03.2018
• Subjects: Au@ZnO/SnO2 nanosheet; Directly grown; Heterojunction; Schottky contact; TEA gas sensing; TEA gas sensing; Directly grown; Schottky contact; Au@ZnO/SnO2 nanosheet; Heterojunction
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.12.016

In this report, uniform SnO2 nanosheets (NSs) have been in-situ grew on the surface of Al2O3 tubes via a cost-efficient hydrothermal synthesis at low temperature. The nanostructures of ZnO/SnO2 were prepared by employing pulsed laser deposition (PLD) method. Furthermore, Au surface modification with DC-sputtering process is used to improve the sensitivity of ZnO/SnO2 NSs sensor to TEA gas. The Au@ZnO/SnO2 NSs exhibited high response (S = 115) to 100 ppm trimethylamine (TEA) gas at 300 °C, which was about 20 times higher than that of the pristine SnO2 NSs. The enhanced sensing properties of Au@ZnO/SnO2 NSs sensor are discussed from the points of Au@ZnO Schottky contact and ZnO/SnO2 n-n heterojunction on the basic of depletion layer model. [Display omitted] •Sheet-like triethylamine gas sensors were in-situ grown on Al2O3 tubes by a facile approach.•The Au@ZnO/SnO2 sensor exhibited highly enhanced sensitivity, which is 115 toward 100 ppm triethylamine at 300 °C.•The depletion layer formed at Au@ZnO/SnO2 interface and the catalytic effect of Au were to improve sensor property.