Photochemical Synthesis and the Seeding-mediated Growth of Gold Nanoparticles Under the Sunlight Radiation

Chem. J. Chinese Universities

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Photochemical Synthesis and the Seeding-mediated Growth of Gold Nanoparticles Under the Sunlight Radiation

WU Hong-Cheng, DONG Shou-An, DONG Ying-Nan, TANG Chun, YANG Sheng-Chun

Kunming Institute of Precious Metals, Kunming 650221, China

Received:2006-05-24 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
Contact: DONG Shou-An

Abstract

Abstract: In the aqueous citrate-chloroauric acid solution, well-dispersed gold nanoparticles were synthesized by the photochemical reduction under the UV solar radiation on plateau. The influences of the pH of the mixture solution and the UV solar radiation conditions on the photochemical reaction rate and the size of gold nanoparticles were investigated. By means of seeding-mediated growth approach, monodispersed spherical gold nanoparticles with an average diameter from 4.9 nm to 9.7 nm and with a narrow size distribution were obtained by varying the ratio of Au(0) seed to Au(Ⅲ) ion under suitable conditions. Based on the charac-terization by UV-Vis adsorption spectrum and transmission electron microscope(TEM), the mechanisms of the freedom radical reaction, the nucleation and growth during the formation process of the gold particles were discussed.

Key words: UV solar radiation, Photochemical reduction, Gold nanoparticles, Seed approach, Mechanism

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WU Hong-Cheng, DONG Shou-An, DONG Ying-Nan, TANG Chun, YANG Sheng-Chun. Photochemical Synthesis and the Seeding-mediated Growth of Gold Nanoparticles Under the Sunlight Radiation[J]. Chem. J. Chinese Universities, doi: .

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Photochemical Synthesis and the Seeding-mediated Growth of Gold Nanoparticles Under the Sunlight Radiation

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