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

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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.

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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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Correspondence to Norio Murase.

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Murase, N., Gaponik, N. & Weller, H. Effect of chemical composition on luminescence of thiol-stabilized CdTe nanocrystals. Nanoscale Res Lett 2, 230 (2007) doi:10.1007/s11671-007-9052-x

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Keywords

  • CdTe
  • Nanocrystal
  • Surfactant
  • Thioglycolic acid
  • Photoluminescence
  • Efficiency
  • Elemental determination