Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 13, Issue 1, Pages 160-170Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2017.03.004
Keywords
Copper (II) oxide; Green synthesis; Raman spectroscopy; Photoluminescence; Nanofluids; Thermal conductivity
Categories
Funding
- National Research Foundation of South Africa (NRF)
- French Centre National pour la Recherche Scientifique
- UNESCO-UNISA Africa Chair in Nanosciences Nanotechnology
- Organization of Women in Science for the Developing World (OWSDW)
- Abdus Salam ICTP via the Nanosciences African Network (NANOAFNET)
- African Laser Centre (ALC)
- iThemba LABS
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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 degrees C. Photoluminescence spectroscopy with UV emissions at 356 nm (3.47 eV) and broad visible emissions at 418 nm, 561 nm, and 664 nm, support the formation in air, at 200 degrees 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 nano-fluid. (C) 2017 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University.
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