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Sone, B.T.; Diallo, A.; Fuku, X.G.; Gurib-Fakim, A.; Maaza, M.
Arabian journal of chemistry, January 2020, 2020-01-00, 2020-01-01, Volume: 13, Issue: 1Journal Article
Display omitted This contribution reports for the first time, room temperature biosynthesis of p-type CuO nanoparticles carried out using Callistemon viminalis’ flower extracts as a chelating agent in a process that is entirely green. Room temperature X-ray diffraction, attenuated IR total reflection spectroscopy, X-ray photoelectron and Raman spectroscopy investigations confirmed the formation of single phase Tenorite bcc monoclinic CuO nanocrystals post annealing in air, at 500°C. Photoluminescence spectroscopy with UV emissions at 356nm (3.47eV) and broad visible emissions at 418nm, 561nm, and 664nm, support the formation in air, at 200°C, of CuO nanoparticles with high surface-to-volume ratios and defects. As a direct application, the biosynthesized CuO nanoplatelet-containing powder dispersed in de-ionized water showed an enhancement of the thermal conductivity from 6% to 34% and a significant stability of the PVP stabilized CuO-water nanofluid.
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