Author:
Li Dong-Ke,He Bing-Yan,Chen Kun-Quan,Pi Ming-Yu,Cui Yu-Ting,Zhang Ding-Ke,
Abstract
Pure and Au nanoparticles loaded WO<sub>3</sub> nanoflowers 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<sub>3</sub> sensor to xylene is investigated. The Au content and the operating temperature are first optimized. It is found that WO<sub>3</sub> with 0.4 μL Au nanoparticles shows the highest sensitivity at an operating temperature of 250 ℃. Compared with pure WO<sub>3</sub>, Au(0.4)/WO<sub>3</sub> possesses 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<sub>3</sub> gas sensing is also proposed and discussed. Au nanoparticles loaded WO<sub>3</sub> nanoflowers are considered to be a promising sensing material for detecting xylene pollutants.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
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