Facile synthesis of ultrafine rGO/WO3 nanowire nanocomposites for highly sensitive toxic NH3 gas sensors
Facile synthesis of ultrafine rGO/WO3 nanowire nanocomposites for highly sensitive toxic NH3 gas sensors
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DOI：
10.1016/j.materresbull.2020.110810
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发表时间：
2020-05-01
影响因子：
5.4
通讯作者：
Nguyen Duc Hoa
中科院分区：
文献类型：
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作者：
Chu Manh Hung;Do Quang Dat;Nguyen Duc Hoa
介绍了一种用于气敏应用的水热法制备RGO/WO_3纳米复合材料的方法。用扫描电子显微镜、高分辨电子显微镜和拉曼光谱等先进技术对RGO/WO纳米复合材料进行了表征，结果表明，高质量的RGO/WO纳米复合材料是由单晶WO纳米线(平均直径为10 nm)由薄的RGO层缠绕而成。传感测量表明，基于rGO/WO_3纳米复合材料的传感器可以在20ppm到500ppm的低浓度范围内检测到剧毒的NH3气体，满足了实际应用的需要。基于rGO/WO_3纳米复合材料的气敏传感器在环境污染监测中具有重要的应用前景，检测下限可达138 ppb。我们还讨论了基于p-n结的rGO/WO_3纳米复合材料的气敏机理。
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.