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Open Access Nano Express

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

Norio Murase12*, Nikolai Gaponik3 and Horst Weller1

Author Affiliations

1 Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Hamburg, Germany

2 Photonics Department, National Institute of Advanced Industrial Science & Technology (AIST), Ikeda, Osaka, 563-8577, Japan

3 Physical Chemistry/Electrochemistry, Technical University of Dresden, Bergstr. 66b, 01062, Dresden, Germany

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Nanoscale Research Letters 2007, 2:230-234  doi:10.1007/s11671-007-9052-x

The electronic version of this article is the complete one and can be found online at:


Received:10 January 2007
Accepted:20 February 2007
Published:13 April 2007

© 2007 to the authors

Abstract

Judicious 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.

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

Nano Express

[1-23]

Acknowledgements

We are grateful to Dr. Frank Meyberg and Ms. Torborg Krugmann for the elemental analysis and Dr. Stephen Hickey for helpful discussion. We also thank Sandra Hirzberger and Alexey Shavel for assisting with the powder XRD measurements and chemical syntheses respectively. NM appreciates the financial support provided by German Academic Exchange Service and Japan Society for the Promotion of Science.

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