Preparation and Characterization of Tungsten Oxide Thick Film Gas Sensor
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 7
Abstract
Tungsten oxide (WO3) thick films are prepared by screen printing method for detection of pollutant gases. WO3 thick films characteristics was investigated for X-ray diffraction to determine the structure and phases. The X-ray diffraction patterns indicate that the thick films fired at 600, 700 and 800°C are polycrystalline. Surface morphological and compositional characterizations of the prepared pure WO3 thick films were determined using SEM with EDAX. The temperature dependent electrical resistance variations for pure WO3 thick films were investigated. The electrical resistivity, TCR, activation energy of pure WO3 thick films was obtained. WO3 thick film Sensor response is investigated for various gases for different concentrations. It is found that tungsten oxide based thick film sensor is a good candidate for NO2 sensors with satisfactory response and recovery times. The sensing mechanism associated with NO2 gas detection is also discussed. The prepared sensor is characterized by XRD and SEM.,
Authors and Affiliations
K. B. Bhamare, T. R. Mahale, R. Y. Borse
Keywords
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