Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2016 Vol: 8 Issue: 3

Synthesis, characterisation and its antimicrobial studies of silver and gold nanoparticles and their nanoalloys

Abstract

This paper explains the antimicrobial studies of Ag-Au alloys. The silver nanoparticles were prepared by seeding method. In past few years, wide applicability of silver nanoparticles (AgNPs) in various field attract for an approach of rapid, cost effective and eco-friendly synthesis of AgNPs that is expanding research toward biological methods(1).Gold Nanoparticles was prepared by citrate reduction method. The citrate reduction method for the synthesis of gold nanoparticles (GNPs) has known advantages but usually provides the products with low nanoparticle concentration and limits its application. Herein, we report a facile method to synthesize GNPs from concentrated chloroauric acid (2.5 mM) via adding sodium hydroxide and controlling the temperature. It was found that adding a proper amount of sodium hydroxide can produce uniform concentrated GNPs with low size distribution; otherwise, the largely distributed nanoparticles or instable colloids were obtained(2). Their nanoalloys are prepared. Their antimicrobial activities are studied using against Gram- negative bacteria. Standard strain of Escherichia coli (ATCC 25922 strain), was used for evaluating antimicrobial property of AgNps-AuNps Nanoalloys.