Green synthesis of zno nanoparticles using partheniumnyctanthes arbor tristis
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This contribution reports on the synthesis and the main physical properties of ZnO nanoparticles synthesized for the first time by a completely green process using Agathosma betulina plant extract as an effective chelating agent. The surface/interface and volume room temperature properties of these quasi-spherical 15.8 nm in size ZnO nanoparticles by transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, attenuated total reflection IR and Raman spectroscopy are reported. Likewise, a spark sintered pellet made of such nanoparticles exhibited a significant nonlinear current-voltage exponential response characteristics of a varistor.
Biological reduction agents are being explored worldwide to minimize the effects of toxic chemicals used in nanoparticle fabrication. The present study states a green approach for the synthesis of zinc oxide nanoparticles employing aqueous flower extract of Nyctanthes arbor-tristis. Flower extract was used as the biological reduction agent for synthesizing zinc oxide nanoparticles from zinc acetate dihydrate. Synthesis conditions were optimized for maximal and narrow size range synthesis of zinc oxide nanoparticles. The resultant nanopowder was characterized using various analytical techniques, such as UV–Visible spectroscopy, Fourier Transform Infrared spectroscopy, X-ray diffraction, Dynamic Light Scattering and Transmission Electron Microscopy. The nanopowder was stored in dried form and was found to be stable after 4 months. The size range of nanoparticles obtained upon synthesis at optimum conditions was 12–32 nm as reported by TEM. X-ray diffraction studies confirmed the crystalline nature of the nanoparticles indicating particle size within the range provided by electron microscopy data. Nanoparticles were tested for their antifungal potential and were found to be active against all five tested phytopathogens with lowest MIC value recorded as 16 μg/mL. Hence, an easy and effective green approach for synthesis of zinc oxide nanoparticles, with efficient antifungal potential is reported in this study.