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Issue 15, 2016
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Cyclic voltammetry as a sensitive method for in situ probing of chemical transformations in quantum dots

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Abstract

The application of electrochemical methods for the characterization of colloidal quantum dots (QDs) attracts considerable attention as these methods may allow for monitoring of some crucial parameters, such as energetic levels of conduction and valence bands as well as surface traps and ligands under real conditions of colloidal solution. In the present work we extend the applications of cyclic voltammetry (CV) to in situ monitoring of degradation processes of water-soluble CdTe QDs. This degradation occurs under lowering of pH to the values around 5, i.e. under conditions relevant to bioimaging applications of these QDs, and is accompanied by pronounced changes of their photoluminescence. Observed correlations between characteristic features of CV diagrams and the fluorescence spectra allowed us to propose mechanisms responsible for evolution of the photoluminescence properties as well as degradation pathway of CdTe QDs at low pH.

Graphical abstract: Cyclic voltammetry as a sensitive method for in situ probing of chemical transformations in quantum dots

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Supplementary files

Article information


Submitted
17 Feb 2016
Accepted
09 Mar 2016
First published
09 Mar 2016

Phys. Chem. Chem. Phys., 2016,18, 10355-10361
Article type
Paper

Cyclic voltammetry as a sensitive method for in situ probing of chemical transformations in quantum dots

N. P. Osipovich, S. K. Poznyak, V. Lesnyak and N. Gaponik, Phys. Chem. Chem. Phys., 2016, 18, 10355
DOI: 10.1039/C6CP01085G

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