Facile synthesis of nanostructured CuO for low temperature NO2 sensing |
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| Institution: | 1. Surface and Nanoscience Division, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, India;2. Sensor System Technology, VIT University, Vellore 632014, India;1. School of Materials Science and Engineering, Tianjin University of Technology, China;2. School of Environmental Science and Safety Engineering, Tianjin University of Technology, China;3. Tianjin Key Lab for Photoelectric Materials & Devices, Tianjin University of Technology, Tianjin 300384, China;1. School of Chemistry & Chemical Engineering, Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Tianjin University of Technology, Tianjin 300384, PR China;2. Department of Materials Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), College of Chemistry, Nankai University, Tianjin 300071, PR China |
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| Abstract: | Detection of environmental pollutant and health hazardous, nitrogen dioxide (NO2) is reported using nanostructured CuO particulates (NPs). Powder X-ray diffraction and field emission scanning electron microscopy were used to probe crystalline phase and morphological details, respectively. Small crystallites of ∼10–12 nm and a strain of 4% were found in the leafy structure of CuO. Raman studies further supported the presence of nanosized CuO phase. This is the first instance of utilizing CuO NPs to detect 5 ppm of NO2 even at a low operating temperature of 50 °C. The highest sensitivity for NO2 was observed at 150 °C, for the first time, in CuO NPs. A low activation energy of 0.18 eV was found for sensing process. The CuO NPs sensor responded to NO2 within a few seconds and recovered totally under a minute. The kinetics of the NO2 gas adsorption on the CuO film surface was described following the Elovich model. |
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| Keywords: | Nanostructured copper oxide Nitrogen dioxide Sensor Adsorption kinetics |
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