A simple biphasic route to water soluble dithiocarbamate functionalized quantum dots

作者：Wang Jun; Xu Jun; Goodman Matthew D; Chen Ying; Cai Min; Shinar Joseph; Lin Zhiqun^*

来源：Journal of Materials Chemistry, 2008, 18(27): 3270-3274.

DOI：10.1039/b803618g

Hydrophobic trioctylphosphine oxide-functionalized CdS equantum 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 TiO(2) nanoparticles. A decrease in the PL of the mixture was observed, indicating a possible charge transfer from the D-CdSe QDs to the TiO(2) nanoparticles. The reaction of the carboxyl group on the D-CdSe surface with the hydroxyl group on the TiO(2) rendered QDs in direct contact with TiO(2), thereby facilitating the electronic interaction between them.

• 出版日期2008