金属負イオン注入による二酸化チタンルチルの光触媒効率の改善 Improvement of Photocatalytic Efficiencies of Rutile TiO_2 by Metal Negative Ion Implantation
Photocatalytic properties of Cu negative-ion implanted TiO<SUB>2</SUB> (rutile) were investigated as well as light absorption properties due to surface plasmon resonance of Cu nanoparticles in TiO<SUB>2</SUB>. Cu negative ions were implanted into TiO<SUB>2</SUB> at 50 keV and also catalytic efficiencies were measured by decolorization method of methylene blue solution. After thermal treatment at 400°C, implanted sample showed an optical absorption peak at a photon energy 1.9 eV. This photon energy of absorption peaks well agreed with an estimate value of surface plasmon resonance calculated by Mie's theory with n = 2.71. In the catalytic test with methylene blue under irradiation of a fluorescent light, Cu-implanted rutile (50 keV, 7 × 10<SUP>16</SUP> ions/cm<SUP>2</SUP>, 400°C annealed) showed 1.8 times the catalytic efficiency of the unimplanted rutile.
真空 45(3), 177-180, 2002-03-20