Photocatalytic behavior of heavy La-doped TiO_2 films deposited by pulsed laser deposition using non-sintered target

摘要

We have investigated the control of photocatalytic behavior under deposited conditions of non-sintered target of different molar ratios with TiO_2 and La_2O_3 from 1:0 to 1:2 for heavily La doping, and post-annealing temperature from 600 C to 1000 C for crystallizing by pulsed laser deposition. We have successfully crystallized heavily La-doped TiO_2 films with post-annealing temperature over 800 ℃ and with molar ratio of TiO_2: La_2O_3 over 1:1 on a quartz substrate. Heavily La-doped TiO_2 films are observed the decomposition of methylene blue and a water-splitting reaction in photocatalytic behavior under Xe light irradiation. When stoichiometric La-doped TiO_2 (TiO_2:La_2O_3 = 1: 1) is synthesized with heat-treatment at 900 "C, the best results are obtained under photocatalytic behavior and pure La_2Ti_2O_7 crystalline were obtained.