Mesoporous Fe-doped In2O3 nanorods derived from metal organic frameworks for enhanced nitrogen dioxide detection at low temperature |
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| Affiliation: | 1. School of Chemistry & Chemical Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, China;2. Key Laboratory of Tibetan Medicine Research, Northwest Plateau of Biology Institute, Chinese Academy of Sciences. Xining 810008, China;3. Qinghai Provincial Key Laboratory of Tibetan Medicine Research, Northwest Plateau of Biology Institute, Chinese Academy of Sciences. Xining 810008, China;1. School of Physics, University of Electronic Science and Technology of China, Chengdu, 610054, PR China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Science, Taiyuan, 030001, China;3. Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, NE1 8ST, UK;1. Key Lab for Green Chemical Process (Ministry of Education), School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China;2. State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Dalian 116023, PR China;1. School of Microelectronics, Southern University of Science and Technology, Shenzhen 518055, China;2. Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China |
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| Abstract: | Mesoporous Fe-doped In2O3 nanorods derived from metal-organic frameworks (In/Fe-MIL-68s) were synthesized for NO2 detection. The morphologies, structures and NO2 gas-sensing performances of the Fe–In2O3 nanorods were systematically investigated. Texture characterizations demonstrate that the as-prepared Fe–In2O3 nanorods show rich porous structures, high specific surface areas and reduced grain sizes. Gas-sensing measurements display that the Fe–In2O3 nanorods derived from In/Fe-MIL-68s with the Fe(Ⅲ) content of 5 mol.% (Fe(5)-In2O3) exhibit high response (82) and short response/recovery time (70/65 s) towards 2 ppm NO2 at 80 °C compared with their counterparts. Besides, superior selectivity and good stability are observed. The sensing mechanism studies reveal that the improved gas-sensing performances are attributed to the decrease in the gran size, the formation of rich oxygen vacancies and band gaps narrowing caused by Fe(Ⅲ) doping. Therefore, this work indicates that the Fe–In2O3 nanorods derived from metal-organic frameworks precursors can be a promising candidate for NO2 detection. |
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| Keywords: | Mesoporous nanorods Metal-organic frameworks Nitrogen dioxide Gas sensor |
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