Calendula officinalis-mediated biosynthesis of Silver Nanoparticles and their Electrochemical and Optical Characterization

摘要

The metal nanoparticles synthesis is highly explored field of nanotechnology. The biological methodsseem to be more effective. A simple and elegant method is adopted to prepare Silver nanoparticles(AgNPs) in a single step using Calendula officinalis extract (COE) as reducing and stabilizing agent.The plant extract is mixed with AgNO3 to get biosynthesized AgNPs. The biosynthesized AgNPs wereboth optically and electrochemically characterized by UVis, Infrared spectroscopy, TransmissionElectron Microscopy, Fluorescence spectroscopy, Zeta potential and Cyclic Voltammetry. The resultsshowed Calendula officinalis extract is a useful bioreductant for the synthesis of AgNPs. This studyinfers that the size of biosynthesized AgNPs ranges from 30 to 50 nm. The surface plasmon resonancepeak in the UV-Vis absorption spectra shows maximum absorption at 435 nm. Fluorescence spectra ofsilver nanoparticles, which show an emission peak at ~468 nm have also been studied. Zeta potentialanalysis ensured the biosynthesized AgNPs are highly stable. Using this environmentally friendlymethod of biological AgNPs production supplies rates of biosynthesis facile in comparison with otherchemical and engineered routes. The employment of traditional medicine in biosynthesis protocols canInt. J. Electrochem. Sci., Vol. 11, 2016 10796potentially open new doors in various human health and well-being implications such as cosmetics,foods and medicine.