A comparative study of Gold nanoparticles with Chitosan/Gold Nanocomposites.

In the present study, we prepared the gold nanoparticles (AgNPs) and chitosan/gold nanocomposites (CAgNPs) with a slight modification of the Turkevich method. The prepared AgNPs and CAgNPs were characters by UV-Vis, IR spectroscopy and Zetasizer. We found that the prepared AgNPs and CAgNPs have max of 246 nm and 251 nm, respectively. IR spectroscopic studies revealed that the chitosan was present in the prepared CAgNPs. The zeta potential of AgNPs and CAgNPs sol was found to be -45 and -46 in the sodium citrate solution. Moreover, the size of AgNPs was found to be 20 nm with 0.694 polydispersity index and the size of CAgNPs was 46 nm with a polydispersity index of 0.432, respectively. Based on these results we conclude that, chitosan was deposited on the surfaces of CAgNPs and the size was increased when compared with AgNPs and the CAgNPs sol color was changed to violet whereas AgNPs was red colour due to shifting in the max. [ABSTRACT FROM AUTHOR]