Issue 3, 2022

Anharmonicity induced faster decay of hot phonons in rutile TiO2 nanorods: a Raman spectromicroscopy study

Abstract

Temperature-dependent Raman spectromicroscopy of rutile TiO2 nanorods has been studied here to understand the effect of thermal perturbations on different Raman-active phonon modes. The TiO2 nanorods, characterized using electron microscopy, X-ray diffraction and Raman spectroscopy, were prepared using a hydrothermal method. Raman spectra, recorded at temperatures higher than room temperature, have been analyzed within the theoretical framework developed by considering the anharmonicity of hot phonons. Different temperature-dependent responses were observed for Eg and A1g modes with the latter being immune with respect to the Raman peak position. The experimental results indicated a dominant role of phonon–phonon kinematics on peak shifts and broadenings in the Eg Raman mode, confirming the prevalence of the anharmonic effect. The temperature-dependent redshift in the peak position and broadening of the Raman Eg mode have been explained using three or four phonon decay processes. A consolidated insight, by showing a good agreement between experimental and theoretical frameworks, about the behavior of phonons under the influence of elevated temperatures has been presented.

Graphical abstract: Anharmonicity induced faster decay of hot phonons in rutile TiO2 nanorods: a Raman spectromicroscopy study

Supplementary files

Article information

Article type
Paper
Submitted
10 Okt. 2021
Accepted
05 Dec. 2021
First published
14 Dec. 2021
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2022,3, 1602-1608

Anharmonicity induced faster decay of hot phonons in rutile TiO2 nanorods: a Raman spectromicroscopy study

C. Rani, D. K. Pathak, M. Tanwar, S. Kandpal, T. Ghosh, M. Yu. Maximov and R. Kumar, Mater. Adv., 2022, 3, 1602 DOI: 10.1039/D1MA00940K

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