Hydrogen-assisted fabrication of spherical gold nanoparticles through sonochemical reduction of tetrachloride gold(III) ions in water |
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Institution: | 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 |
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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. |
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Keywords: | Gold nanoparticles Ultrasonication High-frequency ultrasound Sonochemical reduction Dissolved gas Hydrogen gas |
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