Synthesis of Au Nano-particles under Energetic Irradiation Fields
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Synthesis of Au Nano-particles under Energetic Irradiation Fields Nobuhiro Maeda1, Taiei Hiroki1, Fuminobu Hori1, Shuichi Okuda2, Ryoichi Taniguchi2, Takao Kojima2, Tadashi Kambara3, Tomoko Abe3 and Akihiro Iwase1 1 Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan 2 Radiation Research Center, Osaka Prefecture University, Sakai, Osaka 599-8570, Japan 3 The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
ABSTRACT Dilute aqueous solutions with Au3+ ions and Polyethylene Glycol Monostearate are irradiated with ~1 MeV γ-ray from 60Co source, 10 MeV pulsed electrons or 1.6 GeV carbon ions. After the irradiation, the color of solutions changes from buff yellow to reddish color. The UV-vis absorption spectra show that after the irradiation, light absorption around 530 nm appears, which corresponds to the excitation of the surface plasmon due to Au nano-particles. The result confirms that the irradiation reduces Au3+ ions in the aqueous solutions and synthesizes Au nano-particles. Size and shape of the nano-particles are examined by using 200kV transmission electron microscope. Effects of irradiation parameters (total dose and dose rate) on Au nano-particle synthesis are discussed.
INTRODUCTION As metallic nano-particles have some specific characters which do not appear in bulk metallic materials, they have been applied for various industrial fields. For example, in the chemical field, they have been used as catalytic agents, sensors and so on, and in the medical field as drug deliverers. Previous work has shown that metallic nano-particles can well be produced through the reduction of metallic ions by sonochemical technique [1, 2]. It is well known that irradiation with high energy γ-ray can also reduce metallic ions in aqueous solutions. High energy γ-ray ionizes H2O molecules, and hydrated electrons and hydrogen radicals are produced in the solution. They act as reductant to Au3+ ions, and Au particles are produced. Therefore, it has been used for the synthesis of metallic nano-particles [3]. The dependence of the structures of synthesized particles on irradiation parameters (i.e. total dose, dose rate, linear energy transfer and so on) has, however, little been discussed. In this study, we have produced Au particles by irradiating aqueous solutions not only with γ-ray but also with pulsed electrons and swift heavy ions, and have examined the effects of irradiation parameters on the synthesis of Au nano-particles.
EXPERIMENTAL PROCEDURE Sample Preparation Samples were dilute aqueous solutions with 0.5 m mol/l Au3+ ions and 0.4 m mol/l Polyethylene Glycol Monostearate (hereinafter referred to as PEG) as surfactants. NaAuCl4
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2H2O was chosen as precursor of Au3+ ions. γ-ray irradiation For γ-ray irradiation, we used 60Co source at Radiation Research Center of Osaka Prefecture University. The energies of γ-ray from 60Co isotope were 1.17 MeV and 1.33 MeV. Aqueous solution with Au3+ ions was poured into Polystyrene c
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