Abstract
Two-stage QD self-assembly leads to the formation of unique supercrystals with four-fold symmetry and strong birefringence.
Highlights
Modern technological development requires the design and fabrication of novel materials with parameters fundamentally different from those of any currently available material, such as: small size, novel functionality, high stability, and facile production.Champagne-Ardenne, 51100 Reims, France e National Research Nuclear University MEPhI ‘‘Moscow Engineering PhysicsInstitute’’, 31 Kashirskoe shosse, 115409 Moscow, Russia † Electronic supplementary information (ESI) available: Sizes and optical properties of quantum dot (QD) samples in solution; microphotographs of the SC4.0 sample of supercrystals; optical images in white light of supercrystals formed by quantum dots (QDs) with different diameters; supercrystal morphology calculated by Bragg’s law from small-angle X-ray scattering (SAXS) pattern; microphotographs of different supercrystals recorded between parallel or crossed polarizers; the optical properties of colloidal solutions of CdSe QDs
Institute’’, 31 Kashirskoe shosse, 115409 Moscow, Russia † Electronic supplementary information (ESI) available: Sizes and optical properties of QD samples in solution; microphotographs of the SC4.0 sample of supercrystals; optical images in white light of supercrystals formed by QDs with different diameters; supercrystal morphology calculated by Bragg’s law from SAXS pattern; microphotographs of different supercrystals recorded between parallel or crossed polarizers; the optical properties of colloidal solutions of CdSe QDs
The process of QD supercrystal growth has been investigated by means of optical and electron microscopic examination of an subsequent investigations of the optical properties of growing superstructures have shown that the formed SCs consisted of 3.1 nm QDs only
Summary
Modern technological development requires the design and fabrication of novel materials with parameters fundamentally different from those of any currently available material, such as: small size, novel functionality, high stability, and facile production.Champagne-Ardenne, 51100 Reims, France e National Research Nuclear University MEPhI ‘‘Moscow Engineering PhysicsInstitute’’, 31 Kashirskoe shosse, 115409 Moscow, Russia † Electronic supplementary information (ESI) available: Sizes and optical properties of QD samples in solution; microphotographs of the SC4.0 sample of supercrystals; optical images in white light of supercrystals formed by QDs with different diameters; supercrystal morphology calculated by Bragg’s law from SAXS pattern; microphotographs of different supercrystals recorded between parallel or crossed polarizers; the optical properties of colloidal solutions of CdSe QDs. These criteria are met perfectly by nanostructured composite materials[1] based on ordered ensembles of nanoparticles, for example, semiconductor nanocrystal quantum dots (QDs) The properties of these materials are determined by both the intrinsic properties of the nanoparticles included in their structure, and by the novel properties resulting from their interactions. Such superstructured materials are used to manipulate and transform electric and magnetic fields,[1,2] for obtaining unique optical responses,[3] generation of coherent light, thermal capacity, and other effects that can be employed in countless applications.
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