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

Lynn Dennany, Matthias Gerlach, Shane O'Carroll, Tia E. Keyes, Robert J. Forster, Paolo Bertoncello

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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.

Original languageEnglish
Pages (from-to)13984-13990
Number of pages7
JournalJournal of Materials Chemistry
Issue number36
Early online date10 Aug 2011
Publication statusPublished - 2011


  • oxygen reduction reaction
  • aqueous solution
  • oxidative stress
  • spherical assemblies
  • electrodes
  • carbon nanotubes
  • glutathione
  • nafion

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