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[Mao Bin,Liu Bin,Wang Yunfu,Li Gongnong,Song Yuzhe,Ma Liping,Liu Guohan.Preparation of Au Colloid of Small Size in Aqueous Solution[J].Rare Metal Materials and Engineering,2009,38(3):515~518.]
Preparation of Au Colloid of Small Size in Aqueous Solution
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Received:February 16, 2008  
Key words: Au colloid  Au nanoparticles  reduction method  synthesis technics
Foundation item:甘肃省科学事业费项目(QS001-C32-01)
Author NameAffiliation
Mao Bin Institute of Sensor Technology of Gansu Academy of Sciences, Lanzhou 730000, China 
Liu Bin  
Wang Yunfu  
Li Gongnong  
Song Yuzhe  
Ma Liping  
Liu Guohan  
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      Au colloid was prepared by reducing HAuCl4·4H2O with Na3C6H5O7·2H2O. The effects of reductant amounts, mixing procedures, reaction time and stirring speed on the concentration, size, shape and monodispersity of Au colloid were investigated. UV-vis and TEM were used to characterize the size, shape, structure and optical properties of the samples. It's found that the optimal conditions for preparing Au colloid of small size are Na3C6H5O7(aq):HAuCl4(aq)=3:1(V:V), mixing Na3C6H5O7 firstly, reacting for 6 min and 650 r/min stirring speed. The colloid was prepared successfully which has superiority in shape, monodispersity and stability. The size of nanoparticles is only about 6~7 nm