NGUYEN TUE ANH*, DANG VAN PHU, NGUYEN NGOC DUY, NGUYEN QUOC HIEN
Research and Development Center for Radiation Technology, Vietnam Atomic Energy Institute
Abstract: Gold nanoparticles with pre-selected size in the range of 5-40 nm were synthesized by γ-irradiation of Au3+ solution containing natural polysaccharide alginate as a stabilizer. The gold nanoparticles with controllable size were prepared by two approaches: i) varying the concentration of Au3+ from 0.25 to 1 mM and alginate from 0.25 to 1 % (w/v) and ii) enlargement of seed particles with double size from 20 to 40 nm at [Au3+]/[Au0]=6. The obtained gold nanoparticles were characterized by UV-vis spectroscopy and transmission electron microscopy. The results indicated that γ-irradiation method is suitable for production of gold nanoparticles with controllable size and high purity.
Keywords: Gold nanoparticles, Sodium alginate, Seed enlargement, γ-irradiation.