期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 18, 期 27, 页码 3270-3274出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b803618g
关键词
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资金
- Directorate For Engineering [0824361] Funding Source: National Science Foundation
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.
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