Paper

Temperature-dependent Raman study of thermal parameters in CdS quantum dots

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Published 7 March 2012 © 2012 IOP Publishing Ltd
, , Citation E S Freitas Neto et al 2012 Nanotechnology 23 125701 DOI 10.1088/0957-4484/23/12/125701

0957-4484/23/12/125701

Abstract

We report on the strong temperature-dependent thermal expansion, αD, in CdS quantum dots (QDs) embedded in a glass template. We have performed a systematic study by using the temperature-dependent first-order Raman spectra, in CdS bulk and in dot samples, in order to assess the size dependence of αD, and where the role of the compressive strain provoked by the glass host matrix on the dot response is discussed. We report the Grüneisen mode parameters and the anharmonic coupling constants for small CdS dots with mean radius R ∼ 2.0 nm. We found that γ parameters change, with respect to the bulk CdS, in a range between 20 and 50%, while the anharmonicity contribution from two-phonon decay channel becomes the most important process to the temperature-shift properties.

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10.1088/0957-4484/23/12/125701