Biogenic synthesis of bimetallic nanoparticles using cassia tora leaf extract

Over recent years, biogenic synthesis of bimetallic nanoparticles from plant extracts has gained much interest from the researchers world widely. Therefore, there is need to divulge the cost effective, nonhazardous and ecofriendly procedures and sources for the synthesis of nanoparticles utilizing the plants. Chemical, physical, and biological methods have been developed to synthesize nanoparticles but chemical and physical methods are involved in the production of toxic byproducts which are hazardous; moreover, the methods are very expensive. The present study reports an environmentally friendly, low cost, novel and rapid method for synthesis of Au-Ag bimetallic nanoparticles. We have developed bimetallic nanoparticles using Cassia tora leaf extract which act as reducing and capping agent. The morphological studies of the biosynthesized nanoparticles are done using UV-vis, TEM, FESEM techniques The EDAX and XRD confirm the crystallinity of the particles. It was observed that use of cassia tora leaf extract makes rapid and convenient method for synthesis of Au-Ag bimetallic nanoparticles. The prepared Au-Ag bimetallic nanoparticles showed surface plasmon resonance centered at 400 nm with particle size range of 7-27 nm. The nanoparticles formation takes place within short time as the reaction is completed in few minutes. This method is inexpensive and highly recommended to be used in large-scale production of Au-Ag bimetallic nanoparticles.