Journal
APPLIED SURFACE SCIENCE
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148721
Keywords
Au nanoparticles; Layered MoO3 nanobelts; Gas sensors; 1-butylamine; Lattice oxygen reaction mechanism
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Funding
- National Nature Science Foundation of China [51974086, 51704070]
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This study demonstrates a material with ultra-high sensitivity towards 1-butylamine, composed of 4 wt% Au nanoparticles decorated on MoO3 nanobelts. The material shows high sensing response and selectivity, potentially promising for practical application.
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 similar to 200 nm, a thickness of 40 nm and a length of several micrometers. The Au/MoO3 composites exhibit ultra-high sensing response (similar to 300) towards 100 ppm of 1-butylamine at the working temperature of 240 degrees C. Even without Au decoration, the pristine MoO3 nanobelts offer the response as high as - similar to 90 toward the same concentration of 1-butylamine at the temperature of 340 degrees 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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