Raman spectra in Sn(1-x)Ir(x)O(2) (x <= 0.15) nanocrystals were investigated to estimate and separate the contributions of phonon confinement and composition effects. To this end, the Raman frequency of the A(1g) bulk-mode of pure SnO(2) and It-mixed nanocrystals has been studied in details as a function of the size and the Iridium concentration. As an initial working hypothesis it was assumed a linear dependence of the Raman shift as a function of the Iridium molar concentration, while a quadratic expansion of the dispersion curve has been utilised in the phonon confinement effect. Comparison of predicted and experimental results is reported. (C) 2010 Elsevier B.V. All rights reserved.
Phonon confinement effect in mixed Sn-Ir oxide nanocrystals
SALIS, MARCELLO;RICCI, PIER CARLO;ANEDDA, ALBERTO
2010-01-01
Abstract
Raman spectra in Sn(1-x)Ir(x)O(2) (x <= 0.15) nanocrystals were investigated to estimate and separate the contributions of phonon confinement and composition effects. To this end, the Raman frequency of the A(1g) bulk-mode of pure SnO(2) and It-mixed nanocrystals has been studied in details as a function of the size and the Iridium concentration. As an initial working hypothesis it was assumed a linear dependence of the Raman shift as a function of the Iridium molar concentration, while a quadratic expansion of the dispersion curve has been utilised in the phonon confinement effect. Comparison of predicted and experimental results is reported. (C) 2010 Elsevier B.V. All rights reserved.
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