Tailoring the particle size of monodispersed colloidal gold

被引:266
作者
Goia, DV [1 ]
Matijevic, E [1 ]
机构
[1] Clarkson Univ, Ctr Adv Mat proc, Potsdam, NY 13699 USA
基金
美国国家科学基金会;
关键词
aggregation of gold particles; colloidal gold; gold monodispersed; iso-ascorbic acid reductant; nanosize gold;
D O I
10.1016/S0927-7757(98)00790-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Monodispersed spherical gold particles ranging in modal diameter from 80 nm to 5 mu m, were prepared by reducing tetrachloroauric(III) acid with iso-ascorbic acid in aqueous solutions at 20 degrees C. The particle size was altered by changing the pH, which affected the composition of gold(III) solute complexes. The latter controlled the redox potential of the system, essential to the formation of the initial nanosize gold dispersions. Depending on the experimental conditions, the resulting primary particles remained either stable or they aggregated to form much larger uniform spheres. The mechanisms of the precipitation of the precursors (primary) particles and of their mutual interactions to yield the final dispersions are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.
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页码:139 / 152
页数:14
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