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Issue 47, 2018
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From colloidal CdSe quantum dots to microscale optically anisotropic supercrystals through bottom-up self-assembly

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Abstract

The development of fabrication techniques for novel nanostructured materials is one of the key tasks of modern materials science. One pathway to successfully complete this task is the bottom-up assembly of colloidal nanoparticles into ordered superstructures, possessing both the properties of individual nanoparticles and further novel properties resulting from their interactions. However, nanoparticle self-assembly depends on a variety of parameters, which makes the precise control of this process a complicated problem. Here, the time course of quantum dot (QD) self-assembly into ordered superstructures has been analyzed, along with the evolution of their morphological and optical properties. QD self-assembly occurs through two distinct stages (homo- and hetero-geneous), leading to the formation of supercrystals with a layered morphology. Analysis of the optical properties throughout the superstructures' growth has shown that the absorption and photoluminescence (PL) bands are blue shifted, retaining almost the same PL lifetimes as in the initial QD solution. The supercrystals formed possess a further unique optical property caused by their layered morphology; namely, a four-fold symmetry characterized by strong birefringence. Such supercrystals may be used for the fabrication of microscale optical paths with high extinction coefficients and specific polarization properties for novel optoelectronic devices.

Graphical abstract: From colloidal CdSe quantum dots to microscale optically anisotropic supercrystals through bottom-up self-assembly

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Supplementary files

Article information


Submitted
21 Sep 2018
Accepted
11 Nov 2018
First published
14 Nov 2018

This article is Open Access

J. Mater. Chem. C, 2018,6, 12904-12911
Article type
Paper

From colloidal CdSe quantum dots to microscale optically anisotropic supercrystals through bottom-up self-assembly

E. V. Ushakova, S. A. Cherevkov, D. A. Volgina, V. V. Zakharov, F. E. Komissarenko, A. A. Shcherbakov, B. T. Hogan, A. Baldycheva, A. V. Fedorov, I. R. Nabiev and A. V. Baranov, J. Mater. Chem. C, 2018, 6, 12904
DOI: 10.1039/C8TC04780D

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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