Synthesis of gold nano particles with enlargement size

Abstract

Gold nanoparticles (AuNPs) with size in the range of 10-53 nm were synthesized by yCo- 60 irradiation using water-soluble chitosan (WSC) as stabilizer and size enlargement by seed approach. Absorption wavelength (Xma,) was measured by LTV-Vis spectroscopy and particle size was determined from TEM images. Results showed that value of Xmax increased from 523 nm (seed particles) to 525, 537 and 549 nm and the size of AuNPs increased from 10 nm (seed particles) to 20, 38 and 53 run, respectively for concentration ratio of Au^ V Au“ (seed) of 2,5, 5 and 10. Antioxidant effect of AuNPS with size of 10, 20, 38 and 53 run was investigated using free radical 2, 2'-azino-bis (3-ethylbenzothiazoline-6-sulphonic acid) (ABTS’ Results mdicated that the smaller the particles size (10 nm) the stronger the antioxidant effect attained. Thus, AuNPsAVSC synthesis by yCo-60 irradiation are promising for applications as antioxidants in cosmetics and m other fields as well.