Xylene gas sensing performance of Au nanoparticlesloaded WO<sub>3</sub> nanoflowers

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Abstract

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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Corresponding author:Zhang Ding-Ke,zhangdk@cqnu.edu.cn

Funds:Project supported by the University Innovation Team Construction Plan of Chongqing, China (Grant No. CXTDX201601016)

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Vol. 68, Issue 19 - 2019-10-05

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