Specific CH4 gas sensor based on tungsten carbide/SnO2 core-shell modified interdigitated electrode

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. 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 nano material 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 22s has obtained from (5.0%WC-doped SnO₂).