Electrochemical properties of green synthesised Zinc oxide (ZnO) Nanoparticles
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.119
Electrochemical properties of green synthesised Zinc oxide (ZnO) Nanoparticles G.G. Welegergs a, b, d,
Z. Y.Nuru
a, b, c
*, H.G. Gebretinsaea, b,d, R. Akobaa, b, e, N. Matinsiea, b,
, M. Maaza
a, b
a
UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa b
Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure Road, Somerset West 7129, PO Box 722, Somerset, West, Western Cape, South Africa c
Debere Berhan University, Department of Chemistry, P.O. Box 445, Debrebirhan, Ethiopia
d
African independent researcher, Adigrat University, Department of Physics, P.O.Box 50, Adigrat, Ethiopia e
Busitema University, Faculty of Science and Education, Physics, P.O.Box 263, Tororo, Uganda
Abstract Bio-reduction agents are being explored to synthesised nanoparticles to minimize the effects of toxic chemicals. The present study was focused on green approach for the synthesis of zinc oxide nanoparticles using aqueous seeds extract of Papaver somniferum. The biosynthesised ZnO NPs (27.8nm) were characterized by using of spectroscopy and microscopy instruments. The surface morphology and the structural analysis confirms the formation of hexagonal nanostructure and a pure zincite nature of ZnO nanoparticles (NPs) respectively. The EDS spectrum confirms pure ZnO NPs were synthesised. From electrochemical properties, the CV indicates both anodic and cathodic sweep are quasi-reversible properties whose intensity increases with the scan rates. The bode plot shows the maximum angles of 74 o which is an indication of a higher conductivity of ZnO NPs.
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1. INTRODUCTION Over the last decade, novel synthesis approaches/methods for nanomaterials (such as metal nanoparticles, carbon nanotubes (CNTs), quantum dots (QDs), graphene, and their composites) for their broad range applications in various fields have been an interesting area in nanoscience and technology [1-6]. Metal oxide nanoparticles (NPs) shows unique chemical, physical, optical, electrical and transport properties, which are very different from those of bulk materials6-9. Among the transition metal oxides, zinc oxide (ZnO) is one of the most exploited ntype semiconducting due of its tunable & multi-functional morphological, photonic and spintronic properties. It is characterized by a wide direct band gap of 3.37 eV, a high excitation energy of 60 meV and used widely in many devices, including surface acoustic wave devices, biomolecular detection, gas sensing, medicinal and optoelectronics [7,10,11,12]. The widely used ZnO nanoparticles have been produced physically and chemically methods. However, synthesis o
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