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.

中文翻译：

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使用半定量能带模型了解双表面工程 WO3 纳米球改进的蒸汽传感器设备性能

采用双表面工程（使用钯（Pd）和还原氧化石墨烯（RGO））WO3纳米球作为传感层，开发了具有高检测范围的快速响应室温乙醇传感器装置。三种不同类型的蒸汽传感器设备，即。i) Pd/WO3（传感器 1）、ii）RGO/WO3（传感器 2）和 iii）Pd/RGO/WO3（传感器 3）用于研究每种元素的影响并说明其在提高气体传感器设备对酒精蒸汽的性能。发现双表面工程器件（传感器 3）在响应幅度、响应时间和恢复时间方面提供非常出色的传感性能，在室温（~ 27°C）下具有非常高的检测范围（1-700 ppm），与其任何单个表面改性设备对应物（传感器 1 或传感器 2）相比。还使用与相应电气等效电路元件相关的半定量能带模型进行了全面讨论，阐明了 RGO 和 Pd 在 WO3 上的个别作用。