2017/04/12 by G. Cristian Vásquez, David Maestre, Ana Cremades +2
Energy · Engineering · #Chalcogenide Semiconductor Thin Films #Thermography and Photoacoustic Techniques #TiO2 Photocatalysis and Solar Cells
paper · doi:10.1002/jrs.5133
openalex publication_date 2017/04/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The Raman signal is highly sensitive to lattice distortions, doping, size effects or excitation source, among other factors. The coexistence of these effects makes occasionally difficult the interpretation of variations in Raman spectra. In this work, size and Cr doping effects have been evaluated by the study of Raman spectra of different undoped and Cr‐doped rutile TiO 2 samples. In the Raman study, two laser sources have been employed with wavelengths in the visible (633 nm) and UV (325 nm) respectively, which entail different surface and spectral sensitivities. Polarization effects have been also evaluated, by modifying the orientation of the probed microstructures with respect to the laser polarization. It has been found that Cr incorporation increases vibration modes at 110, 154, 700 and 810 cm −1 , some of them showing strong dependence with the laser polarization. The relation of these vibration modes with a possible doping‐induced activation of the Raman‐inactive B 1u and A 2u modes, as well as the influence of size effects on the Raman spectra, is evaluated and discussed. Copyright © 2017 John Wiley & Sons, Ltd.