| Summary: | ABSTRACT
Colloidal gold nanoparticlesprepared by employingchitosan as the stabilizer in solvent of methanol-acetic acid
solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave
dispersed and fine gold particles in range of 9.4-10.4 nm. Gold reduction in chitosan matrix was faster at higher
chitosan concentration, and molar ratio of chi: Au, from 5:1 to 40:1. Higher acidity of acetic acid (pH 2-6) led to
faster reduction of gold ions. The intensity of gold metal colloid plasmon band increased at higher concentration of
acetic acid. Chitosan functioned both as a stabilizer and a reducing agent for gold ions. Gold colloidal particles
immobilized on chitosan coated Ti02 as the solid support gave more dispersed and smaller particles (4.6 nm)
compared with gold particles supportedon Ti02 without chitosan coating.
Keywords: gold nanoparticles, chitosan, chitosan coated Ti02
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