Zhang Qingbo, Xie Jianping, Yang Jinhua, Lee Jim Yang
Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore.
ACS Nano. 2009 Jan 27;3(1):139-48. doi: 10.1021/nn800531q.
This paper reports the synthesis and self-assembly of monodisperse icosahedral Ag, Au, and Pd nanoparticles with tunable sizes. Ag nanoparticles were first prepared by a modified polyol method. The as-synthesized Ag nanoparticles were all icosahedral multiply twinned particles (MTPs) with notable size variations. The variability was reduced to less than 5% after a digestive ripening post treatment. The nearly monodisperse Ag nanoparticles were then used in replacement reactions with Au and Pd precursors to produce monodisperse icosahedral Au and Pd nanoparticles. The size of the monodisperse icosahedral Ag, Au, and Pd nanoparticles could also be increased thereafter by seed-mediated growth. The closely matched geometrical attributes of these icosahedral nanoparticles allowed them to easily self-assemble into 3-D superlattices either in the solution phase or on a solid substrate.
本文报道了尺寸可调的单分散二十面体银、金和钯纳米颗粒的合成与自组装。银纳米颗粒首先通过改进的多元醇法制备。所合成的银纳米颗粒均为二十面体多重孪晶颗粒（MTPs），尺寸变化显著。经过消化熟化后处理，尺寸变化率降低至小于5%。然后将近乎单分散的银纳米颗粒用于与金和钯前驱体的置换反应，以制备单分散二十面体金和钯纳米颗粒。此后，通过种子介导生长还可以增大单分散二十面体银、金和钯纳米颗粒的尺寸。这些二十面体纳米颗粒紧密匹配的几何特性使它们能够在溶液相中或固体基质上轻松自组装成三维超晶格。
