化学还原法制备小粒径金纳米粒子

doi:10.3969/j.issn.1001-4381.2013.05.006

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Abstract The colloidal gold nanoparticles were prepared by reducing chloroauric acid with NaBH₄ in the presence of polyvinyl pyrrolidone (PVP). The influences of the amount of NaBH₄ and PVP, reaction temperature and the order of adding NaBH₄ on the morphology, particle size and dispersion of the synthesized gold nanoparticles are discussed. The gold nanoparticles’ morphology and particle size distribution were characterized by transmission electron microscopy and UV-Vis spectroscopy. The results show that the optimized processing parameters for preparing gold nanoparticles with an average diameter of 4.3nm were worked out, the molar ratio of NaBH₄ to chloroauric acid is 3.75:1; the mass ratio of PVP to chloroauric acid is 1:1; the reaction temperature is 100℃; the NaBH₄ is added after chloroauric acid. The ways of influencing factors were explained and the reasons were analyzed.

Key words： gold nanoparticle chemical reduction NaBH₄ PVP

Received: 18 January 2012 Published: 20 May 2013

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http://jme.biam.ac.cn/EN/10.3969/j.issn.1001-4381.2013.05.006 OR http://jme.biam.ac.cn/EN/Y2013/V0/I5/28

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