Dipole-Dipole Interactions in Nanoparticle Superlattices
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- 作者：Dmitri V. Talapin ; Elena V. Shevchenko ; Christopher B. Murray ; Alexey V. Titov ; Petr Krá ; l
- 刊名：Nano Letters
- 出版年：2007
- 出版时间：May 2007
- 年：2007
- 卷：7
- 期：5
- 页码：1213 - 1219
- 全文大小：2088K
- 年卷期：v.7,no.5(May 2007)
- ISSN：1530-6992
文摘
Nanoparticles often self-assemble into hexagonal-close-packed (hcp) structures although it is predicted to be less stable than face-centered-cubic (fcc) packing in hard-sphere models. In addition to close-packed fcc and hcp superlattices, we observe formation of nonclose-packedsimple-hexagonal (sh) superlattices of nearly spherical PbS, PbSe, and 
-Fe2O3 nanocrystals. This surprisingly rich phase diagram ofmonodisperse semiconducting nanoparticles is explained by considering the interactions between nonlocal dipoles of individual nanoparticles.By calculating the total electrostatic and dispersive energies, we explain stability of the hcp and sh nanoparticle superlattices, introduce thesuperlattice phase diagram, and predict antiferroelectric ordering in dipolar nanoparticle superlattices.
-Fe2O3 nanocrystals. This surprisingly rich phase diagram ofmonodisperse semiconducting nanoparticles is explained by considering the interactions between nonlocal dipoles of individual nanoparticles.By calculating the total electrostatic and dispersive energies, we explain stability of the hcp and sh nanoparticle superlattices, introduce thesuperlattice phase diagram, and predict antiferroelectric ordering in dipolar nanoparticle superlattices.