Abstract
Fast responding room temperature ethanol sensor device, having high detection range, was developed employing dual surface engineered (using palladium (Pd) and Reduced Graphene oxide (RGO)) WO3 nanospheres as the sensing layer. Three different types of vapor sensor devices, viz. i) Pd/WO3 (Sensor 1), ii) RGO/WO3 (Sensor 2) and iii) Pd/RGO/WO3 (Sensor 3) were fabricated to study the influence of each of the elements and to account for its exact contribution in improving the gas sensor device performance towards alcohol vapors. Dual surface engineered device (Sensor 3) was found to offer remarkably superior sensing performance in terms of response magnitude, response time and recovery time with a very high detection range (1-700 ppm) at room temperature (~ 27 °C), compared to any of its single surface modified device counterpart (Sensor 1 or Sensor 2). A comprehensive discussion elucidating the individual role of RGO and Pd on WO3 has also been presented employing a semi-quantitative energy band model in correlation with the corresponding electrical equivalent circuit elements.
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