Dipolar structures in colloidal dispersions of PbSe and CdSe quantum dots
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Publication date
2007
Authors
Klokkenburg, M.
Houtepen, Arjan Jeroen
Koole, R.
de Folter, J.W.J.
Erné, B.
van Faassen, E.E.H.
Vanmaekelbergh, D.A.M.
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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.
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Klokkenburg, M, Houtepen, A J, Koole, R, de Folter, J W J, Erne, B H, van Faassen, E E H & Vanmaekelbergh, D A M 2007, 'Dipolar structures in colloidal dispersions of PbSe and CdSe quantum dots', Nano Letters, vol. 7, no. 9, pp. 2931-2936.