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Issue 36, 2011
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Electrochemiluminescence (ECL) sensing properties of water soluble core-shell CdSe/ZnS quantum dots/Nafion composite films

Lynn Dennany,ae  Matthias Gerlach,a  Shane O'Carroll,a  Tia E. Keyes,ac  Robert J. Forster*abc  and  Paolo Bertoncello*acd 
Author affiliations

* Corresponding authors

a National Biophotonics & Imaging Platform Ireland, Dublin City University, Dublin 9, Ireland
E-mail: robert.forster@dcu.ie, p.bertoncello@swansea.ac.uk

b Biomedical Diagnostics Institute, Dublin City University, Dublin 9, Ireland

c School of Chemical Sciences, Dublin City University, Dublin 9, Ireland

d College of Engineering, Multidisciplinary Nanotechnology Centre and Centre for NanoHealth, Swansea University, Swansea, United Kingdom

e Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, United Kingdom

Abstract

Water soluble positively charged 2-(dimethylamino)ethanethiol (DAET)-protected core-shell CdSe/ZnS quantum dots (QDs) were synthesized and incorporated within negatively charged Nafion polymer films. The water soluble QDs were characterized using UV-visible and fluorescence spectroscopies. Nafion/QDs composite films were deposited on glassy carbon electrodes and characterized using cyclic voltammetry. The electrochemiluminescence (ECL) using hydrogen peroxide as co-reactant was enhanced for Nafion/QDs composite films compared to films of the bare QDs. Significantly, no ECL was observed for Nafion/QDs composite films when peroxydisulfate was used as the co-reactant, suggesting that the permselective properties of the Nafion effectively exclude the co-reactant. The ECL quenching by glutathione depends linearly on its concentration when hydrogen peroxide is used as the co-reactant, opening up the possibility to use Nafion/QDs composite films for various electroanalytical applications.

Graphical abstract: Electrochemiluminescence (ECL) sensing properties of water soluble core-shell CdSe/ZnS quantum dots/Nafion composite films

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Publication details

The article was received on 17 May 2011, accepted on 11 Jul 2011 and first published on 10 Aug 2011


Article type: Paper
DOI: 10.1039/C1JM12183A
Citation: J. Mater. Chem., 2011,21, 13984-13990

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    Electrochemiluminescence (ECL) sensing properties of water soluble core-shell CdSe/ZnS quantum dots/Nafion composite films

    L. Dennany, M. Gerlach, S. O'Carroll, T. E. Keyes, R. J. Forster and P. Bertoncello, J. Mater. Chem., 2011, 21, 13984
    DOI: 10.1039/C1JM12183A

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