Elsevier

Journal of Crystal Growth

Volume 269, Issues 2–4, 1 September 2004, Pages 213-217
Journal of Crystal Growth

Cd1−xMnxS quantum dots: new synthesis and characterization

https://doi.org/10.1016/j.jcrysgro.2004.04.119Get rights and content

Abstract

We report on the synthesis of diluted magnetic semiconductor Cd1−xMnxS quantum dots (QDs) by the reverse micelle method using H2S as the sulfur source. The Cd1−xMnxS QDs size ranging from ∼3.2 to ∼4.2 nm can be systematically controlled by the amount of H2S added and is characterized by high-resolution transmission electron microscopy. Manganese compositions in the QDs are estimated by energy dispersive spectrometry to be up to ∼3%. Electron spin resonance spectra analysis indicates that Mn2+ are incorporated into the CdS lattice by substituting Cd2+ sites. Optical absorption spectra of the Cd1−xMnxS QDs exhibit well-defined excitonic peaks resulting from the quantum-confinement effect. The peak position and absorption edge show systematic changes with the QDs sizes and Mn2+ compositions.

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Acknowledgements

This work is supported by the Research Grant Council of Hong Kong via Grant No. HKUST6069/02P.

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