Abstract We introduce a facile and scalable synthesis of rGO/WO3 nanocomposites by hydrothermal method for gas sensing applications. The characterization of rGO/WO3 nanocomposites by some advanced techniques such as scanning electron microscopy, high resolution transmission electron microscopy and Raman spectroscopy revealed that high quality rGO/WO3 nanocomposites included single crystal WO3 nanowires (average diameter of 10 nm) entangled by thin rGO layers. Sensing measurements demonstrated that the rGO/WO3 nanocomposite-based sensor can detect highly toxic NH3 gas at low concentrations ranging from 20 ppm to 500 ppm and fulfills practical applications. The developed gas sensors based on rGO/WO3 nanocomposites have significant application prospects in environment pollution monitoring at detection limit of about 138 ppb. We also discussed the gas sensing mechanism of the rGO/WO3 nanocomposites based on the p-n junction.

中文翻译：

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用于高灵敏度有毒 NH3 气体传感器的超细 rGO/WO3 纳米线纳米复合材料的简便合成

摘要 我们介绍了一种用于气体传感应用的水热法简便且可扩展的 rGO/WO3 纳米复合材料合成方法。通过扫描电子显微镜、高分辨率透射电子显微镜和拉曼光谱等先进技术对 rGO/WO3 纳米复合材料的表征表明，高质量的 rGO/WO3 纳米复合材料包括单晶 WO3 纳米线（平均直径为 10 nm）被薄 rGO 层缠结. 传感测量表明，基于 rGO/WO3 纳米复合材料的传感器可以检测 20 ppm 至 500 ppm 低浓度的剧毒 NH3 气体，并满足实际应用。开发的基于 rGO/WO3 纳米复合材料的气体传感器在环境污染监测中具有显着的应用前景，检测限约为 138 ppb。