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Sensors (Basel). 2018 Jan 29;18(2). pii: E390. doi: 10.3390/s18020390.

The Effect of Zeolite Composition and Grain Size on Gas Sensing Properties of SnO₂/Zeolite Sensor.

Author information

1
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China. syh@dlnu.edu.cn.
2
College of Information & Communication Engineering, Dalian Minzu University, Dalian 116600, China. syh@dlnu.edu.cn.
3
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China. wangjing@dlut.edu.cn.
4
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China. lixg@dlut.edu.cn.
5
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China. duhaiying@dlnu.edu.cn.
6
College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, China. duhaiying@dlnu.edu.cn.
7
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China. huangqingpan@mail.dlut.edu.cn.
8
School of Mathematical and Physical Sciences, Dalian University of Technology, Panjin Campus, Panjin 124000, China. wangxf@dlut.edu.cn.

Abstract

In order to improve the sensing properties of tin dioxide gas sensor, four kinds of different SiO₂/Al₂O₃ ratio, different particle size of MFI type zeolites (ZSM-5) were coated on the SnO₂ to prepared zeolite modified gas sensors, and the gas sensing properties were tested. The measurement results showed that the response values of ZSM-5 zeolite (SiO₂/Al₂O₃ = 70, grain size 300 nm) coated SnO₂ gas sensors to formaldehyde vapor were increased, and the response to acetone decreased compared with that of SnO₂ gas sensor, indicating an improved selectivity property. The other three ZSM-5 zeolites with SiO₂/Al₂O₃ 70, 150 and 470, respectively, and grain sizes all around 1 μm coated SnO₂ sensors did not show much difference with SnO₂ sensor for the response properties to both formaldehyde and acetone. The sensing mechanism of ZSM-5 modified sensors was briefly analyzed.

KEYWORDS:

catalytic property; coating; gas sensor; selectivity; tin dioxide; zeolite

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