Zhou Qu, Hong Changxiang, Li Zhiguang, Peng Shudi, Wu Gaolin, Wang Qian, Zhang Qingyan, Xu Lingna
College of Engineering and Technology, Southwest University, Chongqing 400715, China.
School of Electrical Engineering, Southeast University, Nanjing, 210096, China.
J Nanosci Nanotechnol. 2018 May 1;18(5):3335-3340. doi: 10.1166/jnn.2018.14626.
Pure and Pt-decorated ZnO nanosheets were synthesized via a facile and environment-friendly hydrothermal process, and characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDS), respectively. Side-heated chemical gas sensors were fabricated with the synthesized ZnO based powders and their sensing properties to methane CH4, an important characteristic hydrocarbon contaminant extracted from power transformer oil with overheating or discharging fault, were systemically investigated. Interestingly, Pt decoration not only obviously increased the gas response of sensor fabricated with the synthesized ZnO nanosheets to CH4, but also effectively reduced its optimum operating temperature. Its highest response to 50 ppm of CH4 was about 63.45 at 240 °C, which was about two times larger when compared with the pure one. Meanwhile, the Pt-decorated ZnO nanosheets sensor exhibited shorter response-recovery characteristic, good linearity in low concentration range and excellent stability towards CH4. Those superior sensing features indicate the synthesized Pt-decorated ZnO nanosheets is a promising candidate for fabricating high-performance CH4 sensor.
通过简便且环境友好的水热法合成了纯的和铂修饰的氧化锌纳米片，并分别用X射线粉末衍射（XRD）、场发射扫描电子显微镜（FESEM）和能量色散X射线光谱（EDS）对其进行了表征。用合成的氧化锌基粉末制备了侧面加热的化学气体传感器，并系统地研究了它们对甲烷（CH₄）的传感性能，甲烷是从过热或放电故障的电力变压器油中提取的一种重要的特征性碳氢化合物污染物。有趣的是，铂修饰不仅明显提高了用合成的氧化锌纳米片制备的传感器对CH₄的气体响应，而且有效地降低了其最佳工作温度。在240℃时，其对50 ppm CH₄的最高响应约为63.45，与纯氧化锌纳米片相比大约高出两倍。同时，铂修饰的氧化锌纳米片传感器表现出较短的响应-恢复特性，在低浓度范围内具有良好的线性以及对CH₄具有优异的稳定性。这些优异的传感特性表明，合成的铂修饰氧化锌纳米片是制造高性能CH₄传感器的有前途候选材料。
