Dipolar Structures in Colloidal Dispersions of PbSe and CdSe Quantum Dots
- 22 August 2007
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 7 (9), 2931-2936
- https://doi.org/10.1021/nl0714684
Abstract
We show by cryogenic transmission electron microscopy that PbSe and CdSe nanocrystals of various shapes in a liquid colloidal dispersion self-assemble into equilibrium structures that have a pronounced dipolar character, to an extent that depends on particle concentration and size. Analyzing the cluster-size distributions with a one-dimensional (1D) aggregation model yields a dipolar pair attraction of 8−10 kBT at room temperature. This accounts for the long-range alignment of the crystal planes of individual nanocrystals in self-assembled superstructures and for anisotropic nanostructures grown via oriented attachment.Keywords
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