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本文采用水热法成功制备了Au纳米颗粒负载的WO 3纳米花材料, 并运用XRD, SEM, TEM等手段对其晶体结构和形貌进行了表征, 并详细研究了其对二甲苯的气敏性能. 首先对Au的浓度和气敏元件的工作温度进行了优化, 结果表明, 0.4 μl Au纳米颗粒负载的WO 3对二甲苯的灵敏度最高, 最佳工作温度为250 ℃. 同纯WO 3相比, Au纳米颗粒负载的WO 3纳米花具有更快的响应/恢复速度和更高的目标气体选择性, 在100 ppm二甲苯中灵敏度达到了29.5. 此外, 检测限度可以低至5 ppm水平. 最后对气敏元件表面可能发生的氧化还原反应的机理进行了研究和讨论, 认为Au负载的WO 3纳米花材料有望应用于二甲苯气体传感器.Pure and Au nanoparticles loaded WO 3nanoflowers are synthesized by the hydrothermal method.The structures and morphologies of the as-prepared products are characterized by X-ray diffraction (XRD),scanning electron microswcope (SEM), and transmission electron microscope (TEM). The gas sensing performance of the Au/WO 3sensor to xylene is investigated. The Au content and the operating temperature are first optimized. It is found that WO 3with 0.4 μL Au nanoparticles shows the highest sensitivity at an operating temperature of 250 ℃. Compared with pure WO 3, Au(0.4)/WO 3possesses fast response/recovery speed and high target gas selectivity. Its sensitivity to 100 ppm xylene is 29.5. Meanwhile, the practical detection limitation is as low as 0.5 ppm. Finally, the mechanism of Au/WO 3gas sensing is also proposed and discussed. Au nanoparticles loaded WO 3nanoflowers are considered to be a promising sensing material for detecting xylene pollutants.
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Keywords:
- WO3/
- Au nanoparticles/
- xylene/
- gas sensing properties
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