Abstract
The coating with a porous structure, having a good adhesion to the substrate and containing titanium dioxide in the modifications of rutile and anatase, has been obtained by plasma electrolytic oxidation of VT1–0 technically pure titanium in a 0.1 M neutral aqueous solution of Na2SO4. Gold 10-nm-layer has been deposited on surface by electron-beam evaporation to obtain Ti/TiO2/Au composite. This gold layer consists of 5 nm gold nanoparticles, which has been determined based on the coherent scattering regions for the diffraction peak (111) using the Debye-Scherrer method. Deposition of 10-nm gold layer on the surface of Ti/TiO2 results in increase in photocurrent densities from 3·10−9 A/cm2 to 4·10−6 A/cm2. Calculation from the slopes of the Mott-Schottky plots enable one to estimate the number of charge carriers (donors) and the flat band potential vs Ag/AgCl, which are ND = 3.9·1019 cm−3, Efb = – 0.14 V for Ti/TiO2 and ND = 3.0·1020 cm−3, Efb = – 0.4 V for Ti/TiO2/Au composite.
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