Direct Fabrication of La2Ti2O7 Films on Titanium Metal Substrate by Hydrothermal Reaction

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In order to fabricate LaTiO2N electrodes, which have been reported as visible-light-active water-splitting photocatalysts, La2Ti2O7 films were prepared on titanium substrates as precursor films. The films were characterized by X-ray diffraction and field emission scanning electron microscopy. La2Ti2O7 films were prepared directly on titanium metal substrates by hydrothermal reactions using a titanium substrate and La2O3 powder in deionized water at 573 K for 60 h. The cell parameters of La2Ti2O7 prepared by hydrothermal reaction were a = 7.80 Å, b = 13.00 Å, c = 5.54 Å, and γ = 98.59°; these are in good agreement with published values. The effect of experimental parameters such as reaction temperature and time on crystallinity, film thickness, and surface morphology of the products has been studied.
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