Electrostatic self-assembly of binary nanoparticle crystals with a diamond-like lattice
Electrostatic self-assembly of binary nanoparticle crystals with a diamond-like lattice
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DOI：
10.1126/science.1125124
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发表时间：
2006-04-21
期刊：
影响因子：
56.9
通讯作者：
Grzybowski, BA
中科院分区：
文献类型：
--
作者：
Kalsin, AM;Fialkowski, M;Grzybowski, BA
两种类型（金和银）的带电的、大小相等的金属纳米颗粒的自组装导致形成大的闪锌矿（类金刚石）晶体，其中每个纳米颗粒具有四个带相反电荷的邻居。这些非紧密堆积结构的形成是纳米级特有的静电效应的结果，其中屏蔽层的厚度与组装物体的尺寸相称。由于较小的结晶颗粒对较大结晶颗粒的静电稳定，可以从多分散的纳米颗粒溶液中获得质量更好的晶体。
Self-assembly of charged, equally sized metal nanoparticles of two types (gold and silver) leads to the formation of large, sphalerite (diamond-like) crystals, in which each nanoparticle has four oppositely charged neighbors. Formation of these non-close-packed structures is a consequence of electrostatic effects specific to the nanoscale, where the thickness of the screening layer is commensurate with the dimensions of the assembling objects. Because of electrostatic stabilization of larger crystallizing particles by smaller ones, better-quality crystals can be obtained from more polydisperse nanoparticle solutions.