Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 28, Issue 11, Pages 6649-6655Publisher
SPRINGER
DOI: 10.1007/s11665-019-04450-z
Keywords
CuS; ethanol; gas sensor; monitoring
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Funding
- National Natural Science Foundation of China [21476034]
- Key Research &Development Project of Liaoning Province [2017308005]
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Flower-shaped CuS as a p-type gas-sensing material was synthesized by a facile hydrothermal method in this study. Morphology, structure, and chemical composition of the synthesized CuS gas-sensing material were analyzed by SEM, XRD, XPS, and N-2 adsorption adsorption-desorption technique. Gas-sensing properties of the as-prepared CuS sensors were also investigated toward ethanol monitoring. The results showed that the flower-like CuS nanostructures consisted of interconnected nanosheets and exhibited good crystallinity. With the increase in ethanol concentration, the sensitivity of the CuS sensor significantly increased and indicated a roughly linear relationship at the optimal operating temperature of 260 degrees C. The ethanol-selective characteristics of the CuS sensor against other interfering gases including methanol, benzene, dichloromethane, and hexane were studied, and the gas response of the CuS sensor synthesized at 170 degrees C toward 100 ppm ethanol was 5.22, which was significantly higher than all the other gases. Moreover, 14-day continuous measurement further confirmed the excellent stability of the CuS sensor.
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