Nanocrystalline Tungsten Oxide Thick Film Sensor for the Detection of H2S Gas
Metal oxide semiconductors (MOS) have been utilized as gas sensing active materials for half a century. One of the most promising solid-state MO S chemo sensors is n-type semiconducting tungsten oxide-based gas sensor. They have demonstrated novel sensing properties such as high sensitivity, fast response time and low operation temperature. In particular, pure or doped tungsten oxide is a promising material for the detection of various substances, e.g., H 2 ,H 2 S,NOx, NH 3 and ethanol. Scientists have investigated the sensing characteristics of WO 3 nanoparticles to H 2 S in the 7 to 200 ppm range at working temperatures of the range of 100–225 ℃. Semiconductor gas sensors based on nanocrystalline WO 3 powders were ...