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K. Vivehananthan*, S.Yamini Sudha Lakshmi, W.H. De Silva and S.A. Kumar


Nanotechnology is an emerging interdisciplinary field which mainly concerns with the fabrication of nanoparticles with specific requirements in terms of size, shape and controlled dispersity. Over the last few decades, the synthesis of noble metal nanoparticles have been the subject of many applied researches due to their unique chemical and physical properties. Among the nobel metals, silver nanoparticles are of great scientific interest as they have very unique and promising properties that make them highly suitable for many nanotechnological applications. A number of approaches are available for the synthesis of silver nanoparticles. Of all the methods available for nanoparticle synthesis, bioinspired synthesis of nanoparticles has become a sprouting area that has proven to be better as it offers good manipulation and control over nanoparticle growth and their stabilization. The present investigations is an attempt to synthesis silver nanoparticles from Azadirachta indica (neem) leaf extract and characterize them using UV–visible absorption spectroscopy, X-ray diffraction (XRD), Fourier transform spectroscopy (FTIR), Transmission electron microscopy (TEM) & Scanning electron microscopy (SEM). In UV visible spectroscopy, a strong surface plasmon resonance band was obtained in the range of 430-435 nm indicating the rapid formation of silver nanoparticles. The TEM and SEM images showed that silver nanoparticals are roughly spherical and of uniform particle size, and the average particle size is 100 nm. Nanoparticle XRD patterns revealed three characteristic peaks corresponding to three different facets of silver; (111), (200) and (220). The FTIR spectra reflected distinctive bands which are indicative of bioorganics involving in the reduction of silver ions into silver nanoparticles. In conclusion, it has been proven that Azadirachta indica extract is found to be effective in synthesizing silver nanoparticles of desired characteristics to be applied in different fields.

Keywords: Azadirachta indica, FTIR, SEM, Silver nanoparticles, TEM and XRD.

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