Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5370346 | Applied Surface Science | 2006 | 5 Pages |
The use of Raman and anti-stokes Raman spectroscopy to investigate the effect of exposure to high power laser radiation on the crystalline phases of TiO2 has been investigated. Measurement of the changes, over several time integrals, in the Raman and anti-stokes Raman of TiO2 spectra with exposure to laser radiation is reported. Raman and anti-stokes Raman provide detail on both the structure and the kinetic process of changes in crystalline phases in the titania material. The effect of laser exposure resulted in the generation of increasing amounts of the rutile crystalline phase from the anatase crystalline phase during exposure. The Raman spectra displayed bands at 144Â cmâ1 (A1g), 197Â cmâ1 (Eg), 398Â cmâ1 (B1g), 515Â cmâ1 (A1g), and 640Â cmâ1 (Eg) assigned to anatase which were replaced by bands at 143Â cmâ1 (B1g), 235Â cmâ1 (2 phonon process), 448Â cmâ1 (Eg) and 612Â cmâ1 (A1g) which were assigned to rutile. This indicated that laser irradiation of TiO2 changes the crystalline phase from anatase to rutile. Raman and anti-stokes Raman are highly sensitive to the crystalline forms of TiO2 and allow characterisation of the effect of laser irradiation upon TiO2. This technique would also be applicable as an in situ method for monitoring changes during the laser irradiation process.