Preparation and characterization of 1-2 nm dendrimer-encapsulated gold nanoparticles having very narrow size distributions

被引:317
作者
Kim, YG [1 ]
Oh, SK [1 ]
Crooks, RM [1 ]
机构
[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA
关键词
D O I
10.1021/cm034932o
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
Highly monodisperse, 1-2-nm diameter Au nanoparticles were prepared using poly(amidoamine) (PAMAM) dendrimers as templates. The synthesis is carried out in water, takes less than 30 min, and requires no subsequent purification. Au nanoparticles having diameters of 1.3 +/- 0.3 and 1.6 +/- 0.3 nm were obtained when 55 and 140 equiv, respectively, of HAuCl4 per dendrimer were used. For unpurified Au nanoparticles in this size range, this represents more than a 200% improvement in size distribution compared to previous reports. The high monodispersity is a function of the template synthesis, which avoids size variations arising from random nucleation and growth phenomena, and the use of magic number equivalent ratios of AuCl4-/dendrimer. When a nonmagic number of AuCl4- equivalents per dendrimer was used, a significantly more polydisperse distribution of Au nanoparticles was obtained.
引用
收藏
页码:167 / 172
页数:6
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