A novel single step chemical route is described to embed the silver and gold nanoparticles in composite films. The embedded composite films were characterized with, UV-vis, TEM and XPS analysis. The sizes of the noble metal nanoparticles are in the range of 12-16 nm. Potential possibilities as antimicrobial coating against Escherichia coli is presented. © 2005 Elsevier B.V. All rights reserved.

Balasubramanian Viswanathan

Thirukkallam Kanthadai Varadarajan

Escherichia coli

Gold

Nanostructured materials

Transmission electron microscopy

X ray photoelectron spectroscopy

Antimicrobial activity

NOBLE METAL NANOPARTICLES

ORGANIC-INORGANIC NANOCOMPOSITE

SILICOTUNGSTIC ACID

Composite materials

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Materials Chemistry and Physics

A simple method to embed noble metal (Ag, Au) nanoparticles in organic-inorganic nanocomposite films by single step method is described. This is accomplished by the assistance of Keggin ions present in the composite film. The photochemically reduced composite film has served both as a reducing agent and host for the metal nanoparticles in a single process. The embedded metal nanoparticles in composites film have been characterized by UV-Visible, TEM, EDAX, XPS techniques. Particles of less than 20 nm were readily embedded using the described approach, and monodisperse nanoparticles were obtained under optimized conditions. The fluorescence experiments showed that embedded Ag and Au nanoparticles are responsible for fluorescence emissions. The described method is facile and simple, and provides a simple potential route to fabricate self-standing noble metal embedded composite films.

Fulltext

Nanoscale Research Letters

Photochemically reduced polyoxometalate assisted generation of silver and gold nanoparticles in composite films: A single step route

In this study, we investigate the antibacterial activity of ZnO nanoparticles with various particle sizes. ZnO was prepared by the base hydrolysis of zinc acetate in a 2-propanol medium and also by a precipitation method using Zn(NO3)2 and NaOH. The products were characterized by x-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. Bacteriological tests such as minimum inhibitory concentration (MIC) and disk diffusion were performed in Luria-Bertani and nutrient agar media on solid agar plates and in liquid broth systems using different concentrations of ZnO by a standard microbial method for the first time. Our bacteriological study showed the enhanced biocidal activity of ZnO nanoparticles compared with bulk ZnO in repeated experiments. This demonstrated that the bactericidal efficacy of ZnO nanoparticles increases with decreasing particle size. It is proposed that both the abrasiveness and the surface oxygen species of ZnO nanoparticles promote the biocidal properties of ZnO nanoparticles. © 2008 National Institute for Materials Science.

Science and Technology of Advanced Materials

Enhanced bioactivity of ZnO nanoparticles—an antimicrobial study

Chemical Physics Letters

Chemical and size effects of nanocomposites of silver and polyvinyl pyrrolidone determined by X-ray photoemission spectroscopy

Chemistry of Materials

Facile In Situ Synthesis of Noble Metal Nanoparticles in Porous Cellulose Fibers

Journal of the American Chemical Society

Keggin Ions as UV-Switchable Reducing Agents in the Synthesis of Au Core−Ag Shell Nanoparticles

Journal of Physics D: Applied Physics

Effect of particle shape distribution on the surface plasmon resonance of Ag SiO2nanocomposite thin films

Chem. Commun.

Gold nanosheets via reduction of aqueous chloroaurate ions by anthracene anions bound to a liquid–liquid interface

A novel single step chemical route for noble metal nanoparticles embedded organic-inorganic composite films

Journal	Materials Chemistry and Physics
ISSN	02540584
Open Access	No