期刊
VIBRATIONAL SPECTROSCOPY
卷 80, 期 -, 页码 79-85出版社
ELSEVIER
DOI: 10.1016/j.vibspec.2015.08.003
关键词
Polarized Raman spectroscopy; Phonon modes assignment; Vanadium dioxide VO2; Thin films
Polarized Raman scattering measurements were performed on (0 1 1)-oriented, over 10 mu m-size VO2 grains on an Al2O3 (0 0 1) substrate. Angular intensity dependence of Raman active modes allowed to observe 17 modes among the 18 expected and to demonstrate the single crystalline character of the large domains. Analyses of intensity evolution have been used to correctly assign phonon modes and to calculate the Raman tensor elements. In addition, a Raman A(g) mode related to the VV stretching vibration was found to have a different behavior versus angle rotation from other A(g) modes, which supports the previous theoretical study and photoexcitation measurements. (C) 2015 Elsevier B.V. All rights reserved.
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