Abstract Developing novel metal oxide semiconductor (MOS) gas-sensing materials with high performance has attracted much attention in the field of gas sensor. In this work, Zn2SnO4 nanoparticles/reduced graphene oxide (ZTO/RGO) nanocomposites with various contents of RGO were successfully synthesized via a solvothermal method combined with subsequent annealing process. Through the present method, ZTO nanoparticles with the size about 20 nm were in situ decorated on the surface of RGO nanosheets. The results of gas-sensing tests indicated that the as-prepared ZTO/RGO showed an enhanced sensing performance to ethanol in comparison with pure ZTO. The response of the sensor fabricated with 8ZTO/RGO (with the optimal mass ratio of ZTO:RGO = 8:1) to 100 ppm ethanol at the optimal operating temperature of 275 °C is as high as 38, which is about 6 times higher than that of the bare ZTO sensor. Besides of high sensitivity, the 8ZTO/RGO sensor also showed impressive selectivity and fast response/recover behavior, as well as good linearity in a relatively wide range of ethanol concentration (5–1200 ppm). These good sensing characteristics make 8ZTO/RGO a promising candidate for practically detecting ethanol. The gas-sensing mechanism of the composite to ethanol was also discussed in detail.

中文翻译：

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Zn 2 SnO 4 纳米颗粒在还原氧化石墨烯上的原位修饰用于高性能乙醇传感器

摘要 开发新型高性能金属氧化物半导体（MOS）气敏材料已引起气体传感器领域的广泛关注。在这项工作中，通过溶剂热法结合后续退火工艺成功合成了具有不同 RGO 含量的 Zn2SnO4 纳米颗粒/还原氧化石墨烯 (ZTO/RGO) 纳米复合材料。通过本方法，在RGO纳米片的表面原位装饰了约20nm的ZTO纳米颗粒。气敏测试结果表明，与纯 ZTO 相比，所制备的 ZTO/RGO 对乙醇的传感性能增强。用 8ZTO/RGO（最佳质量比为 ZTO:RGO = 8:1）制造的传感器对 100 ppm 乙醇在 275 °C 的最佳工作温度下的响应高达 38，这比裸 ZTO 传感器高约 6 倍。除了高灵敏度外，8ZTO/RGO 传感器还显示出令人印象深刻的选择性和快速响应/恢复行为，以及在相对较宽的乙醇浓度范围 (5-1200 ppm) 内具有良好的线性。这些良好的传感特性使 8ZTO/RGO 成为实际检测乙醇的有希望的候选者。还详细讨论了复合材料对乙醇的气敏机制。