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- W2622576142 abstract "Abstract In this work, Au-impregnated WO 3 nanorods with high-aspect-ratio were synthesized by a modified precipitation/impregnation method and systematically investigated for NO 2 detection. Characterizations by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy revealed the formation of 5–20 nm spherical and oval Au nanoparticles loaded on the surface of polycrystalline WO 3 nanorods. WO 3 sensing films with varying Au loading levels from 0 to 2 wt% fabricated by powder pasting and spin coating were tested towards NO 2 over operating temperatures ranging from 25 to 350 °C. It was found that an optimal Au loading of 0.5 wt% led to significant enhancement of NO 2 -sensing performances. In particular, the optimal Au-loaded WO 3 sensing film exhibited the highest response of 836.6 with response time of 64.2 s to 5 ppm NO 2 at the optimal operating temperature of 250 °C. Moreover, the sensor displayed high NO 2 selectivity against NO, N 2 O, C 2 H 5 OH, CO, NH 3 , SO 2 and H 2 . The observed enhancement could be attributed to the formation of metal-semiconductor ohmic junctions and electronic sensitization effects of Au nanoparticles on the porous network of WO 3 nanorods. Therefore, the Au-impregnated WO 3 nanorods are highly potential for sensitive and selective NO 2 detection." @default.
- W2622576142 created "2017-06-15" @default.
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- W2622576142 date "2017-11-01" @default.
- W2622576142 modified "2023-10-17" @default.
- W2622576142 title "Highly sensitive and selective NO2 sensor based on Au-impregnated WO3 nanorods" @default.
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- W2622576142 doi "https://doi.org/10.1016/j.snb.2017.06.011" @default.
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