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Issue 3, 2017
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Inorganically coated colloidal quantum dots in polar solvents using a microemulsion-assisted method

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Abstract

The dielectric nature of organic ligands capping semiconductor colloidal nanocrystals (NCs) makes them incompatible with optoelectronic applications. For this reason, these ligands are regularly substituted through ligand-exchange processes by shorter (even atomic) or inorganic ones. In this work, an alternative path is proposed to obtain inorganically coated NCs. Differently to regular ligand exchange processes, the method reported here produces core–shell NCs and the removal of the original organic shell in a single step. This procedure leads to the formation of connected NCs resembling 1D worm-like networks with improved optical properties and polar solubility, in comparison with the initial CdSe NCs. The nature of the inorganic shell has been elucidated by X-ray Absorption Near Edge Structure (XANES), Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Photoelectron Spectroscopy (XPS). The 1D morphology along with the lack of long insulating organic ligands and the higher solubility in polar media turns these structures very attractive for their further integration into optoelectronic devices.

Graphical abstract: Inorganically coated colloidal quantum dots in polar solvents using a microemulsion-assisted method

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Publication details

The article was received on 12 Oct 2016, accepted on 05 Dec 2016 and first published on 08 Dec 2016


Article type: Paper
DOI: 10.1039/C6CP06982G
Phys. Chem. Chem. Phys., 2017,19, 1999-2007

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    Inorganically coated colloidal quantum dots in polar solvents using a microemulsion-assisted method

    M. Acebrón, F. C. Herrera, M. Mizrahi, C. Navío, R. Bernardo-Gavito, D. Granados, F. G. Requejo and B. H. Juarez, Phys. Chem. Chem. Phys., 2017, 19, 1999
    DOI: 10.1039/C6CP06982G

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