Wu Jie, Yang Ying, Zhang Chengxin, Yu Hui, Huang Licheng, Dong Xiangting, Wang Jinxian, Wang Xinlu
Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, China.
Dalton Trans. 2019 Jun 14;48(22):7720-7727. doi: 10.1039/c9dt01043b. Epub 2019 May 8.
A facile hydrothermal method to prepare In-doped CoO porous nanosheets is reported in this paper for the first time. The prepared samples were made into gas sensors, and their sensing properties, such as response, response time, recovery time, selectivity and stability, have been researched systematically. These results indicate that the sensor fabricated with 1.0 at% In-doped CoO porous nanosheets shows a high response of 6.81 to 50 ppm and an obvious response of 1.4 to 1 ppm HS. What's more, this sensor exhibited a high selectivity and outstanding long-term stability toward HS. The excellent gas sensing performance was mainly ascribed to two reasons. (i) Doping with In increases the concentration of charge carriers, oxygen-deficient regions and the chemisorbed oxygen, which enhances the gas response. (ii) The rough porous structure is conducive to gas adsorption and capture, and provides many active sites for the sensing reaction. Therefore, 1.0 at% In-doped CoO porous nanosheets could be used as a sensing material in future applications.
本文首次报道了一种制备铟掺杂氧化钴多孔纳米片的简便水热法。将制备的样品制成气体传感器，并系统研究了它们的传感性能，如响应度、响应时间、恢复时间、选择性和稳定性。这些结果表明，用1.0原子%铟掺杂氧化钴多孔纳米片制备的传感器对50 ppm的响应度高达6.81，对1 ppm硫化氢的响应明显为1.4。此外，该传感器对硫化氢表现出高选择性和出色的长期稳定性。优异的气敏性能主要归因于两个原因。（i） 铟掺杂增加了载流子浓度、缺氧区域和化学吸附氧，从而增强了气体响应。（ii） 粗糙的多孔结构有利于气体吸附和捕获，并为传感反应提供了许多活性位点。因此，1.0原子%铟掺杂氧化钴多孔纳米片可在未来应用中用作传感材料。
