Sol-Gel Synthesis and Characterization of Mesoporous TiO 2  Modified with Transition Metal Ions (Co, Ni, Mn, Cu)

O. O. Kelyp; I. S. Petrik; V. S. Vorobets; N. P. Smirnova; G. Ya. Kolbasov

doi:10.15407/hftp04.01.105

Sol-Gel Synthesis and Characterization of Mesoporous TiO₂ Modified with Transition Metal Ions (Co, Ni, Mn, Cu)

DOI: https://doi.org/10.15407/hftp04.01.105

O. O. Kelyp, I. S. Petrik, V. S. Vorobets, N. P. Smirnova, G. Ya. Kolbasov

Abstract

Mesoporous nanosized titania films and powders modified with Co²⁺, Ni²⁺, Mn³⁺and Cu²⁺ ions have been produced by templated sol-gel method and characterized by optical spectroscopy, XRD, and BET surface area measurment. After calcinations at 400°C, XRD patterns showed the anatase nanocrystalline phase formation (8–20 nm). The characteristic bands of Co²⁺ and Co³⁺ in octahedral and tetrahedral oxygen environment registered in diffusion reflectance spectra indicated the formation of Co₃O₄spinel phase; crystallization of M/TiO₂ powders after heat treatment at 650°C led to an appearance of absorption bands belonging to Ni²⁺ or Mn³⁺ ions in an octahedral environment. Band gap energy and the position of flat band potentials were estimated by photoelectrochemical measurements. The films doped with transition metals possessed higher photocurrent quantum yield than that for undoped samples.

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