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Colloidal gold nanoparticles (spheres) have been prepared from HAuCl 4 containing aqueous solution by using X-ray irradiation and by chemical reduction method. Gold nanorods were synthesized according to the seed-mediated growth method. The colloidal gold nanoparticles were characterized by using transmission electron microscopy, X-ray diffraction, and UV-VIS absorption spectroscopy. It was found that the concentration of the precursors affects the size of the nanoparticles. In the chemicaldoi:10.1088/1742-6596/187/1/012026 fatcat:mpkh2whbdncfhak42sirlroyb4