Abstract In this paper, ZnO nanocrystals and MoS2/ZnO composites were fabricated by a simple sol-gel method and ultrasonic concussion. Several characterization techniques including XRD, TEM, XPS, Raman spectroscopy and surface photovoltage were employed to explore the samples. The doping of MoS2 nanosheet into the ZnO nanocrystal composites was studied for its effect on NO2 gas-sensitivity under UV irradiation at room temperature. Compared to gas sensors developed from pure ZnO, those developed from ZnO/MoS2 exhibited higher sensitivity with a reversible response. Surface photovoltage results suggest that these desirable sensing features can be attributed to MoS2/ZnO heterojunctions and an abundance of diffusion channels which reduce the energy barrier to promote ready transference and target gas adsorption/desorption. These results offer new opportunities to fabricate composite materials for gas sensors.

中文翻译：

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通过表面光电压技术研究具有增强的紫外光气敏活性的 ZnO 纳米晶包覆的 MoS2 纳米片

摘要 本文采用简单的溶胶-凝胶法和超声震荡法制备了ZnO纳米晶和MoS2/ZnO复合材料。几种表征技术包括XRD、TEM、XPS、拉曼光谱和表面光电压被用来探索样品。研究了将 MoS2 纳米片掺杂到 ZnO 纳米晶体复合材料中，研究其在室温下紫外线照射下对 NO2 气体敏感性的影响。与由纯 ZnO 开发的气体传感器相比，由 ZnO/MoS2 开发的气体传感器具有更高的灵敏度和可逆响应。表面光电压结果表明，这些理想的传感特征可归因于 MoS2/ZnO 异质结和丰富的扩散通道，这些通道减少了能量势垒以促进易转移和目标气体吸附/解吸。