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

Document Type: Research Paper


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

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


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).