Au-loaded mesoporous WO3: Preparation and n-butanol sensing performances

Au-loaded mesoporous WO3 was synthesized by nanocasting method. Mesoporous structure provided a large specific surface area, and the noble metal (Au) improved the catalytic efficiency. The above two characteristics played crucial roles in enhancing the performance of the gas sensors. The as-synthesi...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-11, Vol.236, p.67-76
Main Authors: Wang, Yinglin, Zhang, Bo, Liu, Jie, Yang, Qiuyue, Cui, Xiaobiao, Gao, Yuan, Chuai, Xiaohong, Liu, Fengmin, Sun, Peng, Liang, Xishuang, Sun, Yanfeng, Lu, Geyu
Format: Article
Language:English
Subjects:
Detection
KIT-6
Mesoporous
Methyl alcohol
n-Butanol
Operating temperature
Sensors
Transmission electron microscopy
Tungsten oxides
WO3
X-ray photoelectron spectroscopy
X-rays
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Summary:Au-loaded mesoporous WO3 was synthesized by nanocasting method. Mesoporous structure provided a large specific surface area, and the noble metal (Au) improved the catalytic efficiency. The above two characteristics played crucial roles in enhancing the performance of the gas sensors. The as-synthesized materials were deduced by X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET), Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The obtained materials showed ordered mesoporous structure with excellent crystallinity and the pore size was about 10.8nm which matched with Barrett-Joyner-Halenda analysis. Static test system was employed to measure volatile organic compounds (VOCs) (such as methanol, ethanol, isopropanol and n-butanol) sensing properties for the sensors using mesoporous WO3 and different weight ratios of Au-loaded (0.2%, 0.5% and 1.0%) mesoporous WO3. The sensors loaded with Au exhibited much higher sensitivity and selectivity to n-butanol in this work. Furthermore, Au-loaded materials showed lower operating temperature.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.05.097