P1NM.10 - Flame-made Sb-doped SnO2 Nanoparticulate Sensors for Acetic Acid Sensing

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-1 - Nanomaterials
A. Sukee - 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)
597 - 598


Acetic acid (CH3COOH) is one of the most important volatile organic acid (VOA) since it can be produced by fermentaion and oxidation of natural carbohydrate. It is typically released from objectionable garbage or some spoiled food at ppm levels causing environmental pollution and danger to human health [1]. Hence, it is compelling to develop effective gas-sensing materials to detect the release of acetic acid [2-4]. In this work, Sb-doped SnO2 were synthesized by flame spray pyrolysis in one step (Fig.1) and investigated for acetic acid detection. The as-prepared nanopowders were used to fabricate the sensing films by spin coating and tested towards 50-1000 ppm acetic acid at operating temperature from 150-350°C in dry air. All as-prepared nanopowders and fabricated sensing films were characterized by X-ray analysis, nitrogen adsorption and electron microscopy. From the electrical measurement results (Fig.2), the resistances of SnO2 sensors decreases by 2-3 orders of magnitude with increasing Sb doping level from 0 to 2 wt% due to the Sb substitution at Sn lattice sites, which generates free electrons in conduction band of SnO2, leading to a reduction in its electrical resistivity [3, 4]. From gas-sensing response, the 0.1 wt% Sb-doped SnO2 sensing film exhibited a high response of ~73 toward 1000 ppm acetic acid at 300°C, which is more than one order of magnitude higher than that of undoped one. Therefore, flame-made 0.1 wt% Sb-doped SnO2 sensor is a promising candidate for sensitive detecttion of acetic acid and may be beneficial in food science and environmental applications.