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Effect of chemical composition on luminescence of thiol-stabilized CdTe nanocrystals

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Author(s): Murase Norio | Gaponik Nikolai | Weller Horst

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 2;
Issue: 5;
Start page: 230;
Date: 2007;
Original page

Keywords: CdTe | Nanocrystal | Surfactant | Thioglycolic acid | Photoluminescence | Efficiency | Elemental determination

ABSTRACT
AbstractJudicious selection of the amount of surfactant during synthesis enables a drastic increase in the photoluminescence efficiency of aqueous CdTe nanocrystals (NCs) stabilized by thioglycolic acid (TGA). Elemental determination of the NCs was undertaken to identify the origin of this effect. The molar ratio of (Te + S) to Cd approached unity when the optimum amount of TGA was used during synthesis, whereas the number of S atoms originating from TGA molecules in one NC (2.6 nm of diameter) remained unchanged at 90 ± 3. This indicates that the core lattice composition at the beginning of synthesis, rather than the surface conditions, affects the photoluminescence efficiency of the NCs even after prolonged refluxing.
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