ZnO nanoparticles via Moringa oleifera green synthesis: Physical properties & mechanism of formation

被引：519
作者：
Matinise, N. [1 ,2 ]
Fuku, X. G. [1 ,2 ]
Kaviyarasu, K. [1 ,2 ]
Mayedwa, N. [1 ,2 ]
Maaza, M. [1 ,2 ]
机构：
[1] Univ South Africa, Coll Grad Studies, UNESCO, UNISA Africa Chair Nanosci Nanotechnol, Muckleneuk Ridge,POB 392, Pretoria, South Africa
[2] iThemba LABS Nat Res Fdn, Nanosci African Network NANOAFNET, 1 Old Faure Rd,Somerset West 7129,POB 722, Western Cape, South Africa
来源：
APPLIED SURFACE SCIENCE | 2017年 / 406卷
基金：
新加坡国家研究基金会;
关键词：
ZnO; Nanoparticles; Green chemistry; Electrochemical; Moringa oleifera; ZINC-OXIDE NANOPARTICLES; CDO NANOPARTICLES; THIN-FILMS; PHOTOLUMINESCENCE; NANORODS; EXTRACT; NANOSTRUCTURES; ANTIBACTERIAL;
D O I：
10.1016/j.apsusc.2017.01.219
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The research work involves the development of better and reliable method for the bio-fabrication of Zinc oxide nanoparticles through green method using Moringa Oleifera extract as an effective chelating agent. The electrochemical activity, crystalline structure, morphology, isothermal behavior, chemical composition and optical properties of ZnO nanoparticles were studied using various characterization techniques i.e. Cyclic voltammetry (CV), X-ray powder diffraction (XRD), High resolution transmission electron microscopy (HRTEM), Selected area electron diffraction (SEAD), Differential scanning calorimetry/thermogravimetric analysis (DSC/TGA), Fourier Transform Infrared analysis (FTIR) and Ultraviolet spectroscopy studies (UV-vis). The electrochemical analysis proved that the ZnO nano has high electrochemical activity without any modifications and therefore are considered as a potential candidate in electrochemical applications. The XRD pattern confirmed the crystallinity and pure phase of the sample. DSC/TGA analysis of ZnO sample (before anneal) revealed three endothermic peaks around 140.8 degrees C, 223.7 degrees C and 389.5 degrees C. These endothermic peaks are attributed to the loss of volatile surfactant, conversion of zinc hydroxide to zinc oxide nanoparticles and transformation of zinc oxide into zinc nanoparticles. Mechanisms of formation of the ZnO nanoparticles via the chemical reaction of the Zinc nitrate precursor with the bioactive compounds of the Moringa oleifera are proposed for each of the major family compounds: Vitamins, Flavonoids, and Phenolic acids. (C) 2017 The Author(s). Published by Elsevier B.V.
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页码：339 / 347
页数：9
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