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3D superstructures with an orthorhombic lattice assembled by colloidal PbS quantum dots

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Abstract

We report a new type of metamaterial comprising a highly ordered 3D network of 3–7 nm lead sulfide quantum dots self-assembled in an organic matrix formed by amphiphilic ligands (oleic acid molecules). The obtained 3D superstructures possess an orthorhombic lattice with the distance between the nanocrystals as large as 10–40 nm. Analysis of self-assembly and destruction of the superstructures in time performed by a SAXS technique shows that their morphology depends on the quantity of amphiphilic ligands and width of the quantum dot size and its distribution. Formation of the superstructures is discussed in terms of a model describing the lyotropic crystal formation by micelles from three-phase mixtures. The results show that the organic molecules possessing surfactant properties and capable of forming micelles with nanoparticles as a micelle core can be utilized as building blocks for the creation of novel metamaterials based on a highly ordered 3D network of semiconductors, metals or magnetic nanoparticles.

Graphical abstract: 3D superstructures with an orthorhombic lattice assembled by colloidal PbS quantum dots

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Publication details

The article was received on 08 Feb 2018, accepted on 10 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01163J
Citation: Nanoscale, 2018, Advance Article
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    3D superstructures with an orthorhombic lattice assembled by colloidal PbS quantum dots

    E. V. Ushakova, S. A. Cherevkov, A. P. Litvin, P. S. Parfenov, I. A. Kasatkin, A. V. Fedorov, Y. K. Gun'ko and A. V. Baranov, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR01163J

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