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Issue 27, 2008
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A simple biphasic route to water soluble dithiocarbamate functionalized quantum dots

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Abstract

Hydrophobic trioctylphosphine oxide-functionalized CdSe quantum dots (CdSe-TOPO QDs) were transferred from organic solvent to aqueous solution via a simple yet novel biphasic ligand exchange process in one step, which involved the in-situ formation of hydrophilic dithiocarbamate moieties and subsequent ligand exchange with TOPO at the chloroform/water interface. The resulting water dispersible, dithiocarbamate functionalized CdSe QDs (i.e., D-CdSe) exhibited an increased photoluminescence (PL) quantum yield as compared to the original CdSe-TOPO QDs, suggesting an effective passivation of dithiocarbamate ligands on the QD surface. The D-CdSe QDs were then mixed with hydroxyl terminated TiO2nanoparticles. A decrease in the PL of the mixture was observed, indicating a possible charge transfer from the D-CdSe QDs to the TiO2nanoparticles. The reaction of the carboxyl group on the D-CdSe surface with the hydroxyl group on the TiO2 rendered QDs in direct contact with TiO2, thereby facilitating the electronic interaction between them.

Graphical abstract: A simple biphasic route to water soluble dithiocarbamate functionalized quantum dots

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Publication details

The article was received on 03 Mar 2008, accepted on 28 Apr 2008 and first published on 11 Jun 2008


Article type: Paper
DOI: 10.1039/B803618G
Citation: J. Mater. Chem., 2008,18, 3270-3274
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    A simple biphasic route to water soluble dithiocarbamate functionalized quantum dots

    J. Wang, J. Xu, M. D. Goodman, Y. Chen, M. Cai, J. Shinar and Z. Lin, J. Mater. Chem., 2008, 18, 3270
    DOI: 10.1039/B803618G

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