Enhanced gas sensing properties for ethanol of Ag@ZnSnO 3 nano-composites
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Enhanced gas sensing properties for ethanol of Ag@ZnSnO3 nano-composites Wen Xu1, Xiuyu Wang1,2,3,* Mingming Wang1
, Binxin Leng1, Jiajun Ma1, Zhinan Qi1, Tao Tao1, and
1
School of Microelectronics, Tianjin University, Tianjin 300072, China Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology, Tianjin University, Tianjin 300072, China 3 Key Laboratory for Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China 2
Received: 5 May 2020
ABSTRACT
Accepted: 3 September 2020
Metal semiconductor oxides are widely used in the field of gas sensors in recent years due to the advantages of good gas sensitivity, low raw material cost and facile preparation. To achieve more sensitive, accurate and rapid detection of ethanol gas, tetrakaidecahedral ZnSnO3 nanoparticles were successfully synthesized by means of a facile template-free co-precipitation method. The nanoAg particles were decorated evenly on the surface of the ZnSnO3 particles with a heat treatment at 250 °C. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The results of gas sensing test experiment show that the tetrakaidecahedral ZnSnO3 decorated by nano-Ag (Ag@ZnSnO3) sample has excellent gas sensitivity properties to ethanol at 220 °C. In particular, the composite Ag@ZnSnO3 material gas sensor has a short response time of 2 s and recovery time of 23 s as the nano-Ag modification ratio is 5%. The responsivity of the Ag@ZnSnO3 gas sensor with a modification ratio of 5% to the 500 ppm ethanol is 258 at 220 °C, which is 2.83 times of the pristine ZnSnO3 gas sensor. The minimum limit detection of the sensor to ethanol is 2 ppm. The research in this paper confirms that Ag@ZnSnO3 composite material has potential application prospects in the manufacture of high-performance ethanol sensors.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
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https://doi.org/10.1007/s10854-020-04407-2
J Mater Sci: Mater Electron
1 Introduction Metal oxide semiconductors constitute excellent gas sensing materials with less energy consumption, low raw material cost, superb gas sensitivity, as well as convenience for preparation [1, 2]. ZnO and SnO2 which are two kinds of binary metal oxide semiconductor material (MOSM) have been widely used in many fields such as industrial production [3, 4], environmental monitoring [5], biological protection [6] and so on [7, 8].The composite oxides of ZnO and SnO2, such as ZnSnO3 and Zn2SnO4, have attracted much attentions due to their high chemical response and excellent electronic properties [9, 10]. ZnSnO3 is a kind of ternary metal oxide semiconductor with perovskite structure which combines assets of high sensitivity, good stability and low-cost fabrication [11, 12]. Due to its high electron mobility [13–15], f
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