Pure and Iron incorporated nanostructured Tungsten Oxide (WO_3) thin films were investigated for gas sensing applications using noise spectroscopy. The WO_3 sensor was able to detect lower concentrations (1 ppm-10 ppm) of NH_3, CO, CH_4 and Acetaldehyde gases at higher operating temperatures between 100°C to 250°C. The response of the WO_3 sensor to NH_3, CH_4 and Acetaldehyde at lower temperatures (50°C-100°C) was significant when the sensor was photo-activated using blue-light emitting diode (Blue-LED). The WO_3 with Fe (WO_3:Fe) was found to show some response to Acetaldehyde gas only at relatively higher operating temperature (250°C) and gas concentration of 10 ppm.
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