Synthesis of Gold Nanoparticles and Theimprove-ment of their Optical Properties and Mass Attenua-tion Coefficient under Gamma-ray Irradiation

Au nanoparticles have been synthesis by chemical method. Optical properties of Au nanoparticles have been studied by using UV-Vis and z-scan method and Raman spectroscopy. In addition, the mass attenuation coefficients of the synthesized nanoparticles at different energies were measured by the gamma spectroscopy method. The UV-Vis spectrum of these nanoparticles exhibit an absorption peak at 530 nm region. Nonlinear reflection and nonlinear absorption indexes obtain from close aperture and open aperture z-scan in order of 10-8 cm2/W and 10-4 cm/W were studied with using continue wave Ne: YAG laser λ532 nm by use of closed aperture and open aperture z-scan setup, respectively. The performed measurements show that gamma irradiation affects the mass attenuation coefficient and optical properties of Au nanoparticles.