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Electron beam evaporation of tungsten oxide films for gas sensors

By Tuquabo Tesfamichael


Pure and Iron incorporated nanostructured Tungsten Oxide (WO3) thin films were investigated for gas sensing applications using noise spectroscopy. The WO3 sensor was able to detect lower concentrations (1 ppm-10 ppm) of NH3, CO, CH4 and Acetaldehyde gases at higher operating temperatures between 100oC to 250oC. The response of the WO3 sensor to NH3, CH4 and Acetaldehyde at lower temperatures (50oC-100oC) was significant when the sensor was photo-activated using blue-light emitting diode (Blue-LED). The WO3 with Fe (WO3:Fe) was found to show some response to Acetaldehyde gas only at relatively higher operating temperature (250oC) and gas concentration of 10 ppm

Topics: 020406 Surfaces and Structural Properties of Condensed Matter, 100708 Nanomaterials, 020499 Condensed Matter Physics not elsewhere classified, Gas Sensors, Thin Film Coatings, Optical Properties, Surface Characterisation, Nanomaterials
Year: 2009
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