Ultrahigh methane sensing properties based on Ni-doped hierarchical porous In2O3 microspheres at low temperature

被引：8
作者：
Zhang Y. [1 ]
Cao J. [1 ,2 ]
Wang Y. [2 ]
机构：
[1] College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo
[2] State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo
来源：
Vacuum | 2022年 / 202卷
基金：
中国国家自然科学基金;
关键词：
CH[!sub]4[!/sub] sensors; In[!sub]2[!/sub]O[!sub]3[!/sub; Microspheres; Ni-doped; Porous structure;
D O I：
10.1016/j.vacuum.2022.111149
中图分类号：
学科分类号：
摘要：
Improving the methane (CH4) sensing characteristics of metal oxide semiconductors is a vital research issue. Herein, we reported the synthesis of porous Ni-doped In2O3 microspheres through an effective solvothermal strategy. The composition and structure of the as-prepared samples as well as the CH4 sensing properties were systematically characterized and investigated. The results demonstrate that Ni-doped In2O3 microspheres possess suitable pore sizes, small particle sizes and oxygen-enriched defects. Compared to bare In2O3 sensor, the sensor based on 5.0 mol% Ni-doped In2O3 (NIO-5.0) shows enhanced response (72.727) to 200 ppm CH4 at relatively low operating temperature (140 °C). Meanwhile, it also displays good selectivity, superior repeatability and long-term stability. The enhanced CH4-sensing performance could be mainly attributed to the stable porous structure and the abundant oxygen vacancy defects induced by Ni doping. Significantly, this work provides a great application prospect of Ni-doped In2O3 porous microspheres for low-temperature and high-response CH4 detection. © 2022 Elsevier Ltd
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