Specific Fast Response CH4 Gas Sensor Based on Metal Oxide, Tungsten Carbide /SnO2Core-Shell Modified Interdigitated Electrode

Nikmanesh, S.; Doroodmand, M.M.; Sheikhi, M.H.

Specific Fast Response CH4 Gas Sensor Based on Metal Oxide, Tungsten Carbide /SnO2Core-Shell Modified Interdigitated Electrode

Document Type : Research Paper

Authors

S. Nikmanesh ¹

M.M. Doroodmand ²

M.H. Sheikhi ¹

¹ School of Electrical and Computer engineering, Shiraz University, I. R. Iran

² Department of Chemistry, College of Sciences, Shiraz University, I. R. Iran

Abstract

In this study, a specific CH₄ sensor is fabricated based on interdigitated electrode that modified with core-shell of tungsten carbide/tin oxide (WC/SnO₂) nanoparticles by wet chemical method in different percents of carbon and tungsten. The morphology of wet chemical-synthesized WC/SnO₂ core-shell was evaluated by different methods such as patterned X-ray diffraction (XRD), and particle size analyzer (PSA). The fabricated sensor is selected as specific nanomaterial for CH4 detection. In the fabricated CH₄ sensor, change in resistance of the sensor was considered as the detection system. In this study, figures of merits such as linearity, specificity, response time were also evaluated. No serious interference was evaluated for different foreign gases, introduced to a certain concentration of CH₄. The reliability of the fabricated CH₄ sensor was evaluated via measuring CH4 in several gaseous samples. A fast response time about 8s and recovery time 11s has obtained from (5.0% WC-doped SnO₂).

Keywords

CH4 gas sensor

SnO2

Core-shell

Fast response time