IR absorption spectra of TiO2 submicron powders synthesized by the combustion method

Abstract

A method for synthesizing titanium dioxide using a combustion reaction has been developed, and TiO 2 powders with anatase structure have been obtained. The average particle size (~ 500 nm) and the size of the coherent scattering region (~ 15 nm) are determined, as well as the specific surface, which depends on the type of fuel used in the reaction (5.5 m 2 /g for glycine and 30.5 m 2 /g for citric acid). Annealing in the air at temperatures up to T = 1050 °C leads to a change in the structural modification, resulting in powders with a rutile structure. The IR optical density spectra D(λ) (1 to 12 μm) of TiO 2 powders are studied. The intense absorption band in the spectra is found, the position of which depends on the structural modification of TiO 2 (1.8 μm to 3.1 μm). The analysis of the D(λ) spectra demonstrates that this band is a superposition of two absorption bands, one of which has a maximum at 1.2 μm and can be associated with Ti 3+ ions, the other being due to the polaron-type charge carriers. Augugliaro V., Palmisano L., Sclafani A., Minero C., Pelizzetti E. Photocatalytic degradation of phenol in aqueous titanium dioxide dispersions. Toxicological and Environmental Chemistry, 1988, vol. 16, pp. 89-109. DOI: 10.1080/02772248809357253 4. KeywordsMuscat J., Swamy V., Harrison N.M. First-principles calculations of the phase stability of TiO 2 . Physical Review B, 2002, vol. 65, pp. 224112. DOI: 10.1103 Tanaka K., Capule M.F.V., Hisanaga T. Effect of crystallinity of TiO 2 on its photocatalytic action. Chem. Phys. Lett., 1991, vol. 187, pp. 73-76. DOI: 10.1016/0009-2614 Yang H., Zhu S., Pan N. Studying the mechanisms of titanium dioxide as ultravioletblocking additive for films and fabrics by an improved scheme. J. Appl. Polym. Sci., 2004, vol. 92, pp. 3201-3210. DOI: 10.1002 Kuznetsov V.N., Serpone N. On the Origin of the Spectral Bands in the Visible Absorption Spectra of Visible-Light-Active TiO 2 Specimens Analysis and Assignments. J. Phys. Chem. C, 2009, vol. 113, pp. 15110-15123. DOI: 10.1021/jp901034t 8.Tealdi C., Quartarone E., Galinetto P. et al. Flexible deposition of TiO 2 electrodes for photocatalytic applications: Modulation of the crystal phase as a function of the layer thickness.