采用水热法合成了纯SnO2和4 mol%Ni掺杂SnO2花状微结构.利用X射线衍射仪(XRD)、X射线能谱分析仪(EDS)和扫描电子显微镜(SEM)对其晶相、成分进行了表征,对制备的纯的和Ni掺杂SnO2传感器性能进行了测试.实验结果表明:Ni掺杂可以显著改善SnO2微结构的气敏特性.在最佳工作温度(280℃)条件下,4 mol%Ni掺杂SnO2传感器对100×10-6甲醇的响应可达到13.0,其响应是纯SnO2气体传感器的2.4倍.同时,其具有快速的响应/恢复时间(6 s/5 s),较低的检测极限(1×10-6),以及对甲醇的良好选择性.最后,对Ni掺杂SnO2气体传感器的气敏机理进行了分析讨论.%Pristine SnO2 and 4 mol% Ni-doped SnO2 flower-like microstructures were successfully synthesized by a facile hydrothermal method. The crystal structure and morphology of the samples were characterized by X-ray dif-fraction(XRD),energy dispersive spectroscopy(EDS)and scanning electron microscopy(SEM). Furthermore,gas sensing experiments were conducted on the as-fabricated pristine and Ni-doped SnO2 gas sensors toward methanol. The obtained results demonstrated that the introducing of Ni element can significant enhanced the gas sensing prop-erties of SnO2 microstructure. The measured response of Ni-doped SnO2toward 100×10-6 methanol can reach to 13.0 at the optimum operating temperature of 280 ℃,which is about 2.4 times higher than that of pristine SnO2 . Mean-while,the gas sensor based on Ni-doped SnO2also exhibits fast response/recovery time(~6 s/5 s),low detection limit(1×10-6) and better selectivity to methanol. Finally,the gas sensing mechanism of Ni-doped SnO2 gas sensor was discussed.
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