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

Yanhui Sun; Jing Wang; Xiaogan Li; Haiying Du; Qingpan Huang; Xiaofeng Wang

doi:10.3390/s18020390

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

Sensors (Basel). 2018 Jan 29;18(2):390. doi: 10.3390/s18020390.

Authors

Yanhui Sun^{1

2}, Jing Wang³, Xiaogan Li⁴, Haiying Du^{5

6}, Qingpan Huang⁷, Xiaofeng Wang⁸

Affiliations

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.