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Ultra-high sensitivity and selectivity of Au nanoparticles modified MoO<inf>3</inf> nanobelts towards 1-butylamine
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15.03.2021 |
Fu H.
Wu Z.
Yang X.
He P.
An X.
Xiong S.
Han D.
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Applied Surface Science |
10.1016/j.apsusc.2020.148721 |
0 |
Ссылка
© 2020 This study demonstrates an ultra-sensitive material towards 1-butylamine. The material is composed of 4 wt% Au nanoparticles decorated on MoO3 nanobelts, which are prepared via the hydrothermal method and in-situ reduction. The related characterizations reveal that the nanobelts are highly crystallized layer structures with a width of ~ 200 nm, a thickness of 40 nm and a length of several micrometers. The Au/MoO3 composites exhibit ultra-high sensing response (~300) towards 100 ppm of 1-butylamine at the working temperature of 240 °C. Even without Au decoration, the pristine MoO3 nanobelts offer the response as high as ~ 90 toward the same concentration of 1-butylamine at the temperature of 340 °C, much higher than the existing materials. More importantly, the proposal materials have excellent selectivity towards 1-butylamine, which offers the possibility for practical use. The excellent sensing performance is attributed to the unique sensing mechanism of the layered MoO3 nanobelts via catalytic reaction between 1-butylamine and the lattice oxygen of MoO3. Besides, Au decoration enables to enhance the adsorption of 1-butylamine and facilitate the catalytic sensing process, resulting in further increase in sensing response and selectivity of 1-butylamine. This study may shield light on a promising high-performance gas sensing materials to detect amines in practical application.
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Au decorated In<inf>2</inf>O<inf>3</inf> hollow nanospheres: A novel sensing material toward amine
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01.10.2019 |
Yang X.
Fu H.
Tian Y.
Xie Q.
Xiong S.
Han D.
Zhang H.
An X.
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Sensors and Actuators, B: Chemical |
10.1016/j.snb.2019.126696 |
1 |
Ссылка
© 2019 Elsevier B.V. This study demonstrates a hollow structure constructed by Au nanoparticles decorated on the surface of the In2O3 hollow nanospheres. This structure is prepared via calcination of solid organic precursors and in-situ reduction of Au nanoparticles on the metal oxide surface. The In2O3 hollow nanospheres are with the diameter of ˜200 nm and the shell thickness of 30 nm, while the Au nanoparticles on the surface of In2O3 hollow spheres are with the size of ˜10 nm. XPS indicates that the Au modification can increase the deficient oxygen vacancy ratio, and the presence of the positive Au ions (Auδ+) in the composites helps to trap the electrons and further improve the sensing performance. The gas sensing tests indicate that the Au decorated In2O3 hollow nanocomposites show excellent sensitivity (26.3 of 100 ppm) and selectivity toward 1-butylamine at the optimized temperature of 340 °C. The decoration of Au nanoparticles can lower the optimized working temperature and shorten the response/recovery times. The enhanced sensing mechanism can be attributed to electronic and chemical sensitization. The decoration of Au nanoparticles on the In2O3 surface can cause the Schottky barrier at the interface. The existence of positive Au ions can boost the barrier by trapping extra electrons. These results tender the promising hollow structure for sensing organic amine vapor in field-based use.
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