Ultra-high sensitivity and selectivity of Au nanoparticles modified MoO3 nanobelts towards 1-butylamine

[Display omitted] •Layered structural MoO3 nanobelts with high crystallinity were prepared by a simple hydrothermal method.•Even without Au decoration, MoO3 nanobelts exhibit much higher sensing response than the existing materials.•Au decoration enhances the sensing performance towards 1-butylamine...

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Veröffentlicht in:Applied surface science 2021-03, Vol.542, p.148721, Article 148721
Hauptverfasser: Fu, Haitao, Wu, Zhenxiang, Yang, Xiaohong, He, Peng, An, Xizhong, Xiong, Shixian, Han, Dezhi
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Sprache:eng
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Zusammenfassung:[Display omitted] •Layered structural MoO3 nanobelts with high crystallinity were prepared by a simple hydrothermal method.•Even without Au decoration, MoO3 nanobelts exhibit much higher sensing response than the existing materials.•Au decoration enhances the sensing performance towards 1-butylamine.•High sensing performance is attributed to the lattice reaction mechanism instead of adsorbed oxygen ions. 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.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2020.148721