Cu2O quantum dots modified by RGO nanosheets for ultrasensitive and selective NO2 gas detection |
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| Affiliation: | 1. Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, PR China;2. Chongqing Research Institute CO., Ltd. Of China Coal Technology & Engineering Group, Chongqing 400037, PR China;1. Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India;2. National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India;3. University Science Instrumentation Center, Univ. of Delhi, Delhi 110007, India;1. The State Key Laboratory of Electroanalytic Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China;2. Guangdong Provincial Public Laboratory of Analysis and Testing Technology, Guangdong Institute of Analysis, Guangzhou 510070, People’s Republic of China;1. Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan;2. Green Technology Research Center, Chang Gung University, Taoyuan 33302, Taiwan;3. Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan;4. Department of Neurosurgery, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan;5. College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan |
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| Abstract: | Real-time monitoring of trace NO2 emission has been an emerging challenge in environment and health sectors lately. Aiming to overcome this challenge, NO2 gas sensors based on cuprous oxide quantum dots (Cu2O QDs) anchored onto reduced graphene oxide (RGO) nanosheets serving as a sensitive layer were prepared in this report. Apart from a series of purposive measurements, various characterization techniques such as XRD, Raman, XPS and TEM were employed as well to assist the exploration of sensors performance to NO2 gas. The experimental results revealed a 580% response enhancement for prepared RGO/Cu2O sensors compared with pure RGO counterparts, as well as an excellent selectivity. In a specific experiment, the sensing response attained 4.8% and 29.3% toward 20 ppb and 100 ppb NO2 respectively at 60 °C, which was larger than most Cu2O based resistive gas sensors. Moreover, further subtle modulation of this RGO/Cu2O nanocomposites led to a preferable room-temperature response of 37.8% toward 100 ppb NO2, which also offered a favorable stability of 98.1% response retention after four exposures within ten days. The obtained results imply that the prepared RGO/Cu2O QDs sensors possess a competitive capability of trace NO2 detection. |
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| Keywords: | Gas sensor Thin film Cuprous oxide quantum dots Reduced graphene oxide Nitrogen dioxide |
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