Abstract
Aqueous silver nanocolloid was synthesized in a single step by a biogenic approach using aqueous leaf extract of Lippia javanica plant which acts as both reducing as well as capping agent. The as-synthesized silver nanoparticles were characterized by UV–visible absorption spectroscopy, high-resolution transmission electron microscopy and Fourier transform infrared spectroscopy (FTIR). The UV–Vis absorption spectra of colloidal silver nanoparticles showed characteristic surface plasmon resonance peak centered at a wavelength of 415 nm. The kinetic study showed that the reduction process was complete within 2 h of time. The TEM analysis showed that most of the particles were spherical in shape and their average diameter was about 17.5 nm. FTIR study confirmed the presence of some organic functional groups in leaf extract and their participation during the reduction as well as stabilization process. In addition, the as-synthesized silver nanoparticles showed antimicrobial activity against clinically isolated pathogenic strain of E. coli and B. subtilis.
Highlights
The synthesis of noble metal nanoparticles has been gaining significant importance during the past few years owing to its increasing application in the field of medicine, biology, material science (Vijayakumar et al 2013; Ravindran et al 2013; Narayanan and Park 2013; Xiong et al 2014; Karumuri et al 2013; Geethalakshmi and Sarada 2013; Sharma et al 2009)
Aqueous silver nanocolloid was synthesized in a single step by a biogenic approach using aqueous leaf extract of Lippia javanica plant which acts as both reducing as well as capping agent
The as-synthesized silver nanoparticles were characterized by UV–visible absorption spectroscopy, high-resolution transmission electron microscopy and Fourier transform infrared spectroscopy (FTIR)
Summary
The synthesis of noble metal nanoparticles has been gaining significant importance during the past few years owing to its increasing application in the field of medicine, biology, material science (Vijayakumar et al 2013; Ravindran et al 2013; Narayanan and Park 2013; Xiong et al 2014; Karumuri et al 2013; Geethalakshmi and Sarada 2013; Sharma et al 2009). In the wet chemical process, metal nanoparticle is generally synthesized by reducing metal ion (solution phase) using a reducing agent in presence of a stabilizer To make such synthesis environment friendly, scientists have attempted to use reducing agent as well as stabilizer of biological origin and to use aqueous phase as a reaction medium (Narayanan and Sakthivel 2011; Kumar et al 2014; Merin et al 2010; Kumari and Philip 2013; MubarakAli et al 2011; Rao and Paria 2013; Jha and Prasad 2010).
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