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Citation: Gao Lin-You, Zhu Tao, Liu Zhong-Fan. Synthesis of ld Colloid with Exclusion of Nonspherical Nanoparticles by Seeding Growth[J]. Acta Physico-Chimica Sinica, ;2004, 20(02): 211-215. doi: 10.3866/PKU.WHXB20040222 shu

Synthesis of ld Colloid with Exclusion of Nonspherical Nanoparticles by Seeding Growth

1.
Center for Nanoscale Science and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing　100871

Received Date: 31 July 2003
Available Online: 15 February 2004

This paper reports a method for the preparation of monodispersed ld colloid by seeding growth, with elimination of the nonspherical by-products, which were often observed and difficult to separate in previous works. The formation of nonspherical particles was found to be closely associated with the experimental conditions, such as, molar ratios and addition sequence of the reagents. The larger the [NH2OH]:[HAuCl4] ratio, the less and smaller the nonspherical particles. In addition, the effect of addition sequence can be ascribed to that of [NH2OH]:[HAuCl4] ratio, since different addition sequences make different instantaneous [NH2OH]:[HAuCl4] ratios during the addition and thus lead to different shape distribution of particles. Based on these findings, a method is adopted to rule out the nonspherical particles, by using high ratios of [NH2OH] to [HAuCl4] (the [NH2OH]:[HAuCl4] ratio being kept in the range of 10～30) and favorable addition sequence (NH2OH being added to seeds prior to HAuCl4). No nonspherical nanoparticles can be observed, and the resulted ld colloid shows od monodispersity and excellent size-controllability.
- Seeding growth method; ld nanoparticles;Nonspherical particles
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