Hydrogen-assisted fabrication of spherical gold nanoparticles through sonochemical reduction of tetrachloride gold(III) ions in water期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Hydrogen-assisted fabrication of spherical gold nanoparticles through sonochemical reduction of tetrachloride gold(III) ions in water

Affiliation:	1. Department of Chemistry and Material Engineering, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan;2. Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan

Abstract:	Spherical gold nanoparticles (AuNPs) were selectively synthesized through sonochemical reduction of tetrachloride gold(III) ions ([AuCl₄]⁻) in an aqueous solution of hydrogen tetrachloroaurate(III) tetrahydrate (HAuCl₄·4H₂O) with the aid of hydrogen (H₂) gas in the absence of any additional capping agents. On the other hand, various shaped-AuNPs such as spherical nanoparticles, triangular and hexagonal plates were formed from sonochemical reduction of [AuCl₄]⁻ in argon (Ar)-, nitrogen (N₂)- or oxygen (O₂)-purged aqueous [AuCl₄]⁻ solutions. The selective fabrication of spherical AuNPs assisted by H₂ gas is most likely attributed to the generation of hydrogen radicals (H) promoted by the reaction of H₂ introduced and hydrogen oxide radicals (OH) produced by sonolysis of water.

Keywords:	Gold nanoparticles Ultrasonication High-frequency ultrasound Sonochemical reduction Dissolved gas Hydrogen gas
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