P1AP.4 - Highly Sensitive CH4 Gas Sensors Based on Flame spray made CrOx doped SnO2 Sensing Films for Livestock Farming Applications

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-1 - Applications of Chemical Sensors
K. Bunpang - Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai (Thailand), A. Wisitsoraat, A. Tuantranont, S. Phanichphant, C. Liewhiran - Center of Advanced Materials for Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai (Thailand)
442 - 443


Methane (CH4) is one of the most challenging flammable gases to be detected and controlled for domestic safety or environmental monitoring. Methane sensor is highly needed in gas detection equipments for detecting methane released in home, automotive, industrial settings or livestock farming communities [1,2]. Hence, it is interesting to apply effective sensing materials for sensitive CH4 detection. In this work, the as-prepared 0 2 wt% CrOx doped SnO2 nanoparticles were produced by flame spray pyrolysis in a single step and fabricated as sensitive sensor for detection of CH4. The as prepared nanoparticles and their fabricated sensing films were structurally characterized by X-ray diffraction, Energy-dispersive X-ray spectroscopy, nitrogen adsorption, and electron microscopy. The results confirmed that SnO2 nanoparticles were highly crystalline and CrOx crystallites with mixed oxidation states should form a solid solution with SnO2 matrix. For the gas sensing measurements, fabricated sensors were evaluated at the different CH4 concentrations and operating temperatures ranging from 200 to 400 C in dry air. The test data showed that the optimal 0.5 wt% CrOx-doped SnO2 sensing films exhibited the highest sensor response of ~1250 with a short response time of less than 2 s towards 1 vol% CH4 at 350 C. In addition, the optimal 0.5 wt% CrOx doped SnO2 sensor displayed high stability as well as high selectivity against various environmental and flammable gases. Therefore, the CrOx doped SnO2 nanoparticulate sensor is a promising candidate for highly sensitive and selective CH4 sensor and may be useful in environmental, industrial, and livestock farming applications.