Raman spectra in Sn1−xIrxO2 (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 A1g bulk-mode of pure SnO2 and Ir-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.
Phonon confinement effect in mixed Sn–Ir oxide nanocrystals / M. Salis, P.C. Ricci, G. Cappelletti, A. Anedda. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - 496:1/3(2010 Aug), pp. 109-112. [10.1016/j.cplett.2010.07.018]
Phonon confinement effect in mixed Sn–Ir oxide nanocrystals
G. Cappelletti;
2010
Abstract
Raman spectra in Sn1−xIrxO2 (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 A1g bulk-mode of pure SnO2 and Ir-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.
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