PREPARATION OF CHITOSAN-STABILIZED SILVER (Chi-Ag) NANOPARTICLES USING DIFFERENT REDUCING AGENTS AND TECHNIQUES

Adlim Adlim

Abstract


Metal with nanoparicles size and dispersed particles is part of nanotechnology development including computer
nanochips, medicals, ceramics, catalysts etc. Nano and dispersed particles of silver have been synthesized in this study,
by reducing the silver ions in chitosan solution. The silver ions were reduced by refluxing in methanol, using sodium
borohydride and hydrazine as reducing agent or photo-irradiation technique to produce silver nanoparticles. Silver metal
particles were characterized with UV-Vis Spectroscopy and TEM (Transmission Electron Microscopy). TEM data show
that silver particles were aggregated and in size of >10 nm if hydrazine was used as the reducing agent. Silver
nanoparticels prepared by refluxing in methanol were less aggregated has particle size of > 10 nm with relative deviation
of s/d = 0,2. Dispersed silver particles with size of 3.2-12.6 nm were fabricated by using sodium borohydride as the
reducing agent or photo-irradiation as the reducing technique. With these techniques, silver particles were dispersed
and nearly in uniform size compared with methanol and hydrazine technique. Sodium borohydride reduced silver ions
much faster than other techniques.
Keywords: silver nanoparticles, chitosan, nanotechnology

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