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Sensors 2018, 18(2), 390; https://doi.org/10.3390/s18020390

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

1
Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
2
College of Information & Communication Engineering, Dalian Minzu University, Dalian 116600, China
3
College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian 116600, China
4
School of Mathematical and Physical Sciences, Dalian University of Technology, Panjin Campus, Panjin 124000, China
*
Authors to whom correspondence should be addressed.
Received: 19 December 2017 / Revised: 24 January 2018 / Accepted: 24 January 2018 / Published: 29 January 2018
(This article belongs to the Special Issue Novel Sensors Based on Metal Oxide Films and Structures)
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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. View Full-Text
Keywords: gas sensor; zeolite; tin dioxide; selectivity; catalytic property; coating gas sensor; zeolite; tin dioxide; selectivity; catalytic property; coating
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Sun, Y.; Wang, J.; Li, X.; Du, H.; Huang, Q.; Wang, X. The Effect of Zeolite Composition and Grain Size on Gas Sensing Properties of SnO2/Zeolite Sensor. Sensors 2018, 18, 390.

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