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In this paper, gold nanoparticles (AuNPs) were synthesized in a single and efficient procedure by e–beam and γ–irradiation using chitosan as a stabilizing agent. The investigations on synthesis of AuNPs under ionizing radiation by studying the influence of initial conditions of the preparation of Au(III)–chitosan solutions prior to irradiation on the nucleation process and on the morphological characteristic of the formed nanoparticles. | Journal of Science and Technology 55 (1B) (2017) 13–23 RADIATION SYNTHESIS AND CHARACTERIZATION OF CHITOSAN STABILIZED GOLD NANOPARTICLES AND CATALYTIC ACTIVITY STUDY Vo K. D. N.1, 2, *, Vu Q. A.3 1 2 Institute of Applied Materials Science, Vietnam Academy of Science and Technology 01A TL29 Street, Thanh Loc Ward, District 12, Ho Chi Minh City, Vietnam Graduate University of Science and Technology, Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street, Nghia Do Ward, Cau Giay District, Ha Noi, Vietnam 3 Department of Energy Materials, Faculty of Materials Technology, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam * Email: vndkhoafr@gmail.com Received: 30 December 2016; Accepted for publication: 26 February 2017 ABSTRACT In this paper, gold nanoparticles (AuNPs) were synthesized in a single and efficient procedure by e–beam and γ–irradiation using chitosan as a stabilizing agent. The investigations on synthesis of AuNPs under ionizing radiation by studying the influence of initial conditions of the preparation of Au(III)–chitosan solutions prior to irradiation on the nucleation process and on the morphological characteristic of the formed nanoparticles. The results of UV–vis absorption spectroscopy, transmission electron microscopy indicated that spherical well– dispersed gold nanoparticles ranging from 5 to 10 nm were elaborated, depending on the irradiation dose, the dose rate and the [GLA]/[Au(III)] ratio (GLA: glucosamine units). Furthermore, we also reported the application of the synthesized gold nanoparticles as catalyst in the reduction of 4–nitrophenol (4–NP) to 4–aminophenol (4–AP) by excess sodium borohydride. Keywords: gold nanoparticles, chitosan, irradiation, reduction, 4–nitrophenol. 1. INTRODUCTION Discoveries in the past decade have shown that once materials are synthesized in the form of nanoparticles, they were influenced significantly by their physical and chemical properties. .
