Talapin, Dmitri V. and Shevchenko, Elena V. and Murray, Christopher B. and Titov, Alexey V. and Kral, Petr (2007) Dipole-dipole interactions in nanoparticle superlattices. NANO LETTERS, 7 (5). pp. 1213-1219.
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Official URL: http://dx.doi.org/10.1021/nl070058c
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-packed simple-hexagonal (sh) superlattices of nearly spherical PbS, PbSe, and gamma-Fe2O3 nanocrystals. This surprisingly rich phase diagram of monodisperse 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 the superlattice phase diagram, and predict antiferroelectric ordering in dipolar nanoparticle superlattices.
|Subjects:||Physical Science > Nanophysics|
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Deposited By:||Anuj Seth|
|Deposited On:||09 Jan 2009 17:41|
|Last Modified:||20 Jan 2009 11:47|
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