Green Synthesis of Silver Nanoparticles using Psidium Guajava Leaf Extract and their Characterization
Indian Streams Research Journal, Vol 4, Issue 8, Sept. 2014
10 Pages Posted: 13 Jul 2017
Date Written: September 1, 2014
Abstract
This report shows a rapid and eco-friendly method for green synthesis of silver nanoparticles from aqueous solution of silver nitrate using Psidium Guajava leaf extract as reductant and stabilizer. These biosynthesized nanoparticles were characterized with the help of UV-Vis spectroscopy, Photoluminescence, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), Atomic force microscopy (AFM), Dynamic light scattering (DLS) and Zeta Potential. The different pH viz., 2, 4, 6, 8 and 10 were also adjusted using the pH meter. The UVVis spectra gave surface Plasmon resonance for synthesized silver nanoparticles at 430 nm. The XRD analysis showed that the AgNPs with grain size 30 nm are crystalline in nature and have face-centered cubic geometry. AFM study shows grain size from 15-35 nm, which is correlated with XRD. The FTIR measurement was carried out to identify the possible biomolecules responsible for efficient stabilization of silver nanoparticles. The zeta potential of AgNPs was found to be -20.3 mV, which indicates repulsion among AgNPs and their dispersion stability.
Keywords: Green Synthesis, Psidium Guajava, Silver Nanoparticles, AFM, DLS/ZP
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