CRYSTALLIZATION OF OPALS FROM POLYDISPERSE NANOPARTICLES

被引：337
作者：
OHARA, PC
LEFF, DV
HEATH, JR
GELBART, WM
机构：
[1] Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569
来源：
PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 19期
关键词：
D O I：
10.1103/PhysRevLett.75.3466
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the reversible formation of crystals of nanoparticles (opals) from solutions of polydisperse gold nanocrystals. The structures are identified by transmission electron microscopy, and are characterized by hexagonal domains of large particles at the center, surrounded radially by successively smaller particles. Simulated annealing Monte Carlo calculations are used to demonstrate that these configurations correspond to minimization of the mesoscopic van der Waals energy of polydisperse particles, and the driving force for ordering is the size dependence of dispersional attractions.
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页码：3466 / 3469
页数：4
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