Y-zeolite was first modified by means of ions exchange with Al, Ca and Na, respectively. The modified materials were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and inductively coupled plasma optical emission spectrometry (ICP-OES). Gas sensors were fabricated by SnO2 and coating Y-zeolites on the outside of SnO2 surface, respectively. It was found that the responses of the composites of all types of zeolite- and SnO2-based sensors became lower comparing with that of the pure SnO2-based one response of SnO2 sensor to ethanol vapor. It indicates a suppression effect of zeolites on the response to ethanol vapor. In contrast, the response of the composite-sensing materials of the modified Y-zeolite/SnO2-based sensors except the Ca-modified one to acetone indicates a significantly improved response, 2–3 times higher than that of pure SnO2-based sensor which is smaller than the one of SnO2 sensor. The possible mechanism of the effects of the Y-zeolites on the response of the sensors has been discussed.
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The authors thank the National Natural Science Foundation of China (61574025, 61474012 and 51602035) for financial support. The authors also thank Mr. Liu Xuanzhou for his help in the experiments.
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Huang, Q., Wang, J., Sun, Y. et al. Gas-sensing properties of composites of Y-zeolite and SnO2. J Mater Sci 53, 6729–6740 (2018). https://doi.org/10.1007/s10853-018-2016-y