Accessible Requires Authentication Published by De Gruyter November 12, 2014

Synthesis and characterization of silver cluster particles in hydrogels

Aman Deo and Syed Sauban Ghani


A chitosan-based hydrogel network was crosslinked with genipin; the crosslinked and uncrosslinked hydrogels were prepared and studied. Uniformly distributed silver cluster particles (AgCPs) were prepared using these hydrogel networks as a carrier via in situ reduction of silver nitrate (AgNO3) in the presence of sodium borohydride (NaBH4) as a reducing agent; UV irradiation reduction was also done. Fourier transform infrared (FTIR) spectroscopy studies of the hydrogels gave results on the decree of crosslinking and some indication on the presence of the AgCPs. The spectrophotometric analysis indicated the presence of AgCPs, as a peak appeared around 400 nm. The microscopy analysis gave images of the presence of AgCPs and their size; it showed that the crosslinked hydrogels have uniformly distributed AgCPs and as the crosslinking increased, the AgCPs size decreased. The studies on the increasing concentration of AgNO3 solution gave an increase AgCPs size; the maximum size of AgCPs clusters was ∼0.2 micron in uncrosslinked chitosan. It was demonstrated, by using Escherichia coli (E. coli) bacterium, that the AgCPs hydrogel can be effectively employed as antibacterial material.

Corresponding author: Syed Sauban Ghani, Department of Science, School of Science and Technology, University of Fiji, Lautoka Western PMB, Fiji, e-mail:


The Head, Department of Chemistry, College of Natural Sciences, Arba Minch University, Ethiopia is acknowledged for providing the necessary research facilities. I would like to thank the staff of the Department of Science, The University of Fiji, Fiji for providing technical help and suggestions.


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Received: 2014-7-6
Accepted: 2014-10-2
Published Online: 2014-11-12
Published in Print: 2015-5-1

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