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Highly Selective, ppb-Level Xylene Gas Detection by Sn(2+)-Doped NiO Flower-Like Microspheres Prepared by a One-Step Hydrothermal Method
Detecting xylene gas is an important means of avoiding human harm from gas poisoning. A precise measurement demands that the gas sensor used must have high sensitivity, high selectivity, and low working temperature. To meet these requirements, in this study, Sn(2+)-doped NiO flower-like microspheres...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6651709/ https://www.ncbi.nlm.nih.gov/pubmed/31277489 http://dx.doi.org/10.3390/s19132958 |
Sumario: | Detecting xylene gas is an important means of avoiding human harm from gas poisoning. A precise measurement demands that the gas sensor used must have high sensitivity, high selectivity, and low working temperature. To meet these requirements, in this study, Sn(2+)-doped NiO flower-like microspheres (SNM) with different amounts of Sn(2+) synthesized by a one-step hydrothermal process were investigated. The responses of gas sensors based on different Sn(2+)-doped NiO materials for various targeting gases were fully characterized. It was found that all of the synthesized materials exhibited the best gas response at a working temperature of 180 degrees, which was much lower than the previously reported working temperature range of 300–500 degrees. When exposed to 10 ppm xylene, the 8 at% Sn(2+)-doped NiO sensor (mol ratio) exhibited the highest response, with a value of 30 (R(g)/R(a)). More significantly, the detection limit of the 8 at% Sn(2+)-doped NiO sensor for xylene is down in the ppb level. The Sn(2+)-doped NiO material also exhibits excellent selectivity for other gases with long-term stability and repeatability. The significant improvement in the response to xylene can theoretically be attributed to a decrease in the intrinsic hole carrier concentration, higher amounts of adsorbed oxygen and active sites. |
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