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

Acebron, Maria and Herrera, Facundo C. and Mizrahi, Martin and Navio, Cristina and Bernardo-Gavito, Ramon and Granados, Daniel and Requejo, Felix G. and Juarez, Beatriz H. (2017) Inorganically coated colloidal quantum dots in polar solvents using a microemulsion-assisted method. Physical Chemistry Chemical Physics, 19 (3). pp. 1999-2007. ISSN 1463-9076

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical Chemistry Chemical Physics
Additional Information:
© Royal Society of Chemistry 2017
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600/1606
Subjects:
ID Code:
86051
Deposited By:
Deposited On:
22 May 2017 15:08
Refereed?:
Yes
Published?:
Published
Last Modified:
29 May 2020 03:32