Raman spectroscopy of thermally annealed TiO2 thin films

The application of Raman and anti-stokes Raman spectroscopy for in situ monitoring of structural changes in laser irradiated titanium dioxide materials

“…Raman spectroscopy is a very effective means of detecting these different crystalline phases in TiO 2 powders and the assignment of observed bands to rutile, anatase and brookite has been reported [8][9][10][11][12][13][14]. These crystalline phases are not thermodynamically stable as both anatase and brookite transform irreversibly and exothermically to rutile when heated to high temperatures [10,15,16]. We have previously reported that, when irradiated with laser light the crystal phase of anatase Raman spectroscopy measurements were recorded using an Argon ion laser operating at 514 nm.…”

UV Photoconductivity of Nanocrystalline TiO2Films Annealed in Oxygen

“…Annealing in nonoxygen atmospheres induces nonstoichiometry in TiO 2 . 6,19) It accounts for the loss of photoconductivity in samples annealed in H 2 and N 2 . Annealing in oxygen preserves the stoichiometry of TiO 2 and enhances quantum efficiency in the UV-region of the spectrum.…”

“…6) Among a number of available methods for preparation of TiO 2 thin films, CVD is promising since high deposition rates can be obtained at low substrate temperatures. The obtained TiO 2 films are optically transparent, and exhibit an electrical resistivity of the order of $ 10 9 cm.…”

Grazing-incidence small-angle X-ray scattering and reflectivity on nanostructured oxide films

“…Another Table 1 Sample type, thickness, annealing temperature in degrees of K, 'average particle radii' R , and 'specific surface area' S s , as determined from GISAXS (thickness d = 7 m) interpretation of experimental data is by applying reaction: C + 2O = CO 2 (873 K) [25]. At 1173 K grain size shows anatase-rutile phase transition, which was also recorded by Raman and XRD in our previous work [23,[27][28][29].…”

“…Behaviour of the same material annealed at the same temperatures in nitrogen is slightly different than that in oxygen. The specific surface area reaches maximal value at temperature of 473 K, which is lower than that of annealing in oxygen, which is 773 K. We can connect this with the process of forming nitrogen oxide by reaction, which we Table 2 Sample, thickness, 'average particle radii' R , and 'specific surface area' S s , as determined from GISAXS (thickness d = 7 m) had proposed in our previous work [26,28]:…”