Journal
APPLIED SURFACE SCIENCE
Volume 595, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153545
Keywords
CdS hierarchical microspheres; Solvothermal; Ethanol; Gas sensing; Mechanism analysis
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Funding
- Fundamental Research Funds for the Central Universities [3072021CFT1001]
- Natural Science Foundation of Heilongjiang Province jointly guided project [LH2021B007]
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CdS hierarchical microspheres were prepared and applied as ethanol gas sensors, exhibiting excellent performance including enhanced sensitivity, good repeatability and stability, and fast response/recovery time. The hierarchical microspheres also demonstrated outstanding humidity resistance.
The high concentration (> 100 ppm) ethanol gas that CdS sensors detect commonly results in saturation problem. In this work, CdS hierarchical microspheres with the diameter of 5 mu m-10 mu m assembled with abundant nano-sheets are prepared by a facile one-step solvothermal process. The specific surface area of the CdS material was 27.04 m2.g(-1), which can provide a certain amount of active sites for the target gas and the adsorbed oxygen. In addition, the sensor fabricated by CdS hierarchical microspheres exhibits enhanced sensitivity for C2H5OH to 10 ppm at the optimum operating temperature of 200 C. The sensor also shows good repeatability, excellent stability and fast response/recovery time of 2.8 s/4.8 s for C2H5OH to 100 ppm. Meanwhile, the good linear relationship of the sensor under wide concentration range of 10 ppm-500 ppm for C2H5OH demonstrates outstanding humidity resistance. The possible C2H5OH-sensing mechanism of CdS hierarchical microspheres is discussed on the basis of XPS analysis.
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