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Investigation of structural and optical properties of biosynthesized Zincite (ZnO) nanoparticles (NPs) via an aqueous extract of Rosmarinus officinalis (rosemary) leaves

Published online by Cambridge University Press:  24 April 2020

S. K. Noukelag*
Affiliation:
Nanosciences African Network (NANOAFNET), Material Research Department (MRD), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape, South Africa Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Private Bag X17, Bellville 7535, South Africa
H.E.A. Mohamed
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences & Nanotechnology Laboratories (U2AC2N), College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), Material Research Department (MRD), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape, South Africa
B. Moussa
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences & Nanotechnology Laboratories (U2AC2N), College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), Material Research Department (MRD), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape, South Africa Université Cheikh Anta Diop de Dakar, Département de Physique, Sénégal
L.C. Razanamahandry
Affiliation:
African Union Development Agency, Economic Integration Division, PO Box 1685, Johannesburg, South Africa
S.K.O. Ntwampe
Affiliation:
Bioresource Engineering Research Group (BioERG), Cape Peninsula University of Technology, PO. Box 652, Cape Town, 8000, South Africa School of Chemical Engineering, North West University, Potchefstroom Campus Private Bag X6000, Potchefstroom 2520, South Africa
C.J. Arendse
Affiliation:
Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Private Bag X17, Bellville 7535, South Africa
M. Maaza
Affiliation:
UNESCO-UNISA Africa Chair in Nanosciences & Nanotechnology Laboratories (U2AC2N), College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, PO Box 392, Pretoria, South Africa Nanosciences African Network (NANOAFNET), Material Research Department (MRD), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset West, Western Cape, South Africa
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Abstract

Biosynthesized Zincite nanoparticles have been successfully demonstrated by a completely green process mediated aqueous extract of rosemary leaves acting as both reducing and stabilizing agents and zinc nitrate hexahydrate as the precursor. The synthesis was free of solvents and surfactants to adhere to green chemistry principles and the impartation of environmental benignity. To achieve our objective, structural and optical investigations of ZnO annealed at 500°C for 2hrs were carried-out using complementary techniques. High resolution transmission electron microscopy (HRTEM) revealed the self-assembled, highly agglomerated quasi-hexagonal shaped NPs and the average particle size was found to peak at 15.62 ± 0.22 nm. Selected area electron diffraction (SAED) and X-ray diffraction (XRD) exhibited several diffraction rings with clear diffraction spots confirming their polycrystallinity and the purity of ZnO NPs with a wurtzite structure. Furthermore, the energy dispersive X-ray spectroscopy (EDS) substantiated the presence of Zn and O in the sample and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) illustrated the Zn-O chemical bonds. From UV-Vis-NIR, the optical band gap was amounted to 3.2 eV and photoluminescence (PL) emission spectrum to 2.9eV with high surface defects and oxygen vacancies. Through these results, the use of rosemary leaves extract is hereby shown to be a cost-effective and environmentally friendly alternative to synthesize Zincite nanoparticles (ZnO NPs).

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Copyright
Copyright © Materials Research Society 2020

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Investigation of structural and optical properties of biosynthesized Zincite (ZnO) nanoparticles (NPs) via an aqueous extract of Rosmarinus officinalis (rosemary) leaves
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