Structural,morphological, optical,and magnetic properties of Ni-doped CuO nanostructures prepared by a rapid microwave combustion method |
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| Affiliation: | 1. Catalysis & Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600 034, India;2. Department of Chemistry, The New College (Autonomous), Chennai 600 014, India;3. Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600 127, India;4. Nanotechnology Centre, University of Bahrain, PO Box 32038, Kingdom of Bahrain;5. Department of Physics, College of Science, University of Bahrain, PO Box 32038, Kingdom of Bahrain;1. Catalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India;2. Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600127, India;1. Department of Physics, National Institute of Technology, Kurukshetra 136119, India;2. Centre of Nanotechnology, Indian Institute of Technology, Roorkee 247667, India;1. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;2. Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20742, USA;1. Department of Physics, MIT Campus, Anna University, Chennai, 600044, India;2. Department of Physics, The Standard Fireworks Rajaratnam College for Women, Sivakasi, 626123, India;3. Division of Applied Physics, University of Tsukuba, Ibaraki, 305-8573, Japan;4. Department of Nuclear Physics, Guindy Campus, University of Madras, Chennai, 600025, India;1. Catalysis & Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600034, India;2. P.G. & Research Department of Chemistry, The New College (Autonomous), Chennai 600014, India;3. Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600127, India;4. Nanotechnology Centre, University of Bahrain, PO Box 32038, Bahrain;5. Department of Physics, College of Science, University of Bahrain, PO Box 32038, Bahrain;6. Centre for Advanced Studies in Botany, University of Madras, Chennai 600025, India;1. Institute of Materials Research and Engineering, A*STAR, 2-Fusionopolis Way, Innovis, #08-03, 138634, Singapore;2. Discipline of Metallurgy Engineering and Materials Science, IIT Indore, Simrol, Indore, M.P., 453552, India;3. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, 11155-9466, Iran |
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| Abstract: | In the present paper, we report a facile and rapid microwave-assisted combustion synthesis method for the preparation of pure and Ni-doped CuO nanostructures with different weight ratios (0.5, 1.0, 1.5, and 2.0 at wt% of Ni). The structure and morphology of the pure and Ni-doped CuO samples were investigated by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM), energy dispersive x-ray analysis (EDX), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy and vibrating sample magnetometry (VSM). XRD patterns refined by the Rietveld method indicated the formation of single-phase monoclinic structure and also confirmed that Ni ions are successfully doped into CuO crystal lattice by occupying Cu ionic sites. Interestingly, the morphology was found to transform substantially from nanoflowers to nanoparticles with close-packed periodic array, and then into nanocrystals with the variation of Ni content. The optical band gap estimated using DRS was found to be 3.9 eV for pure CuO and then increases up to 4.3 eV with increasing Ni content. PL spectra at room temperature showed a strong green emission band, and thereby confirmed the above results. Magnetic measurements reveal a room temperature ferromagnetism (RTFM) with an optimum value of saturation magnetization of 1.3140×10−3 emu/g for 2.0 wt% of Ni. |
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| Keywords: | Nanostructures Optical properties Band gap Magnetic measurements |
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