Nanocrystalline tungsten oxide thick film sensor for the detection of H2S gas
نویسندگان
چکیده
Porous tungsten oxide nanocrystalline thick film sensors are prepared for the sensitive detection of H2S gas. The sensor characteristics are investigated with respect to H2S sensing over a temperature range 100-225 0 C in air. Optimum operating temperature for H2S sensing is found to be 200 0 C. Sensor response is investigated for various concentrations and the lowest measurable concentration is found to be 7ppm. It is found that tungsten oxide based thick film sensor is a good candidate for H2S sensors with satisfactory response and recovery times. The sensing mechanism associated with H2S gas detection is also discussed. The prepared sensor is characterized by XRD, SEM, TEM, Raman spectroscopy and XPS.
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