P2GS.29 - Improvement of Gas Sensing Properties for SnO2/Zeolite Composites Prepared by Electrospinning

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-2 - Gas Sensors
Y. Sun, J. Wang, X. Li - Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian (China), H. Du - College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian (China), C. Wang - College of information &communication Engineering, Dalian Minzu University, Dalian (China)
822 - 825


In order to improve the selectivity of the SnO2 gas sensor, different proportions of stannous chloride and nano-ZSM-5 zeolite mixed solution were synthesized, and SnO2/ZSM-5 composites were synthesis by electrospinning. The structure and morphology of the compounds and gas sensing properties were tested. Comparing with the gas sensing properties of the electrospinning SnO2 fibers. The response values of these SnO2/ZSM-5 composites gas sensors to formaldehyde vapor were increased, but the responses to other volatile organic vapors (VOCs) such as acetone, methanol, ethanol were suppressed, indicating an improved gas sensing properties property to formaldehyde. With the increase of the mass ratio of stannous chloride in the mixing process, the response of the composites to formaldehyde was gradually improved. When the mass ratio of stannous chloride to zeolite was 3:1, the composite material has the highest response to formaldehyde. The possible reasons for this contrary observation were proposed to be related to the “synthetic effect” of the catalytic property, molecular sieve property and adsorption property by the zeolite. The sensing mechanism of these composites sensing material was briefly analyzed.