Investigation by X-ray photoelectron spectroscopy of the process of TiC synthesis during annealing of ?i?2/?i?2/? in vacuum

Kryshchuk, T. V., Korduban, O. M., Ogenko, V. M., Medvedskij, M. M. (2020). Investigation by X-ray photoelectron spectroscopy of the process of TiC synthesis during annealing of ?i?2/?i?2/? in vacuum. Bulletin of Taras Shevchenko National University of Kyiv. Physics and Mathematics(4), 85–94. https://doi.org/10.17721/1812-5409.2020/4.12

Small dimensional transition metal carbides (MXenes) are promising materials for the development of photocatalysts and are highly efficient cocatalysts for industrial TiO_2 (P25). Thus, in the Ti_3C_2@TiO_2 nanocomposite obtained by layering Ti_3C_2 nanoplates, the ability to separate charge carriers increases due to the high electrical conductivity of TiC_{1-x}. The task of forming the TiC_{1-x}@TiO_{2-x} nanocomposite by direct synthesis with n-TiO_2 is promising, which allows to increase the quality of contact between the shell and the nanocomposite core and to reduce the number of intermediate stages of synthesis. In addition, highly dispersed TiC has high values of hardness, melting point, modulus of elasticity and shear and has the prospect of use in materials science in plasma spraying coatings. In work TiC was synthesized on the surface of TiO_2 - the shell of the modified micropowder TiH_2/TiO_2/C during reductive annealing in vacuum using TiH_2 as a source of atomic hydrogen. After a series of annealing at 535 ºC - 600 ºC, the Ti2p- C1s- and O1s- spectra of surface atoms were obtained. The main stages of TiC synthesis in the TiO_2/C conversion reaction were established by the XPS method. The use of TiH_2 as a source of atomic hydrogen in nanosystems of the «core/shell» type is proposed for local synthesis on the surface of nanoobjects in a vacuum or inert atmosphere.Key words: X-ray photoelectron spectroscopy, XPS, titanium carbide, TiC, TiO_2, nanopowders.Pages of the article in the issue: 85 - 94Language of the article: Ukrainian