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標題: Characterization and photocatalytic activity of Fe- and N-co-deposited TiO2 and first-principles study for electronic structure
作者: Yen, C.C.
Wang, D.Y.
Chang, L.S.
Shih, H.C.
關鍵字: Titanium dioxide;Photo-catalysis;(Fe,N) co-deposition TiO2;Band gap;energy;First-principle calculation;visible-light irradiation;plasma ion-implantation;nitrogen-doped tio2;titanium-dioxide;thin-films;responsive photocatalyst;iron iii;nanoparticles;decomposition;carbon
Project: Journal of Solid State Chemistry
期刊/報告no:: Journal of Solid State Chemistry, Volume 184, Issue 8, Page(s) 2053-2060.
Titanium dioxide (TiO2), co-deposited with Fe and N, is first implanted with Fe by a metal plasma ion implantation (MPII) process and then annealed in N-2 atmosphere at a temperature regime of 400-600 degrees C. First-principle calculations show that the (Fe, N) co-deposited TiO2 films produced additional band gap levels at the bottom of the conduction band (CB) and on the top of the valence band (VB). The (Fe, N) co-deposited TiO2 films were effective in both prohibiting electron-hole recombination and generating additional Fe-O and N-Ti-O impurity levels for the TiO2 band gap. The (Fe, N) co-deposited TiO2 has a narrower band gap of 1.97 eV than Fe-implanted TiO2 (3.14 eV) and N-doped TiO2 (2.16 eV). A significant reduction of TiO2 band gap energy from 3.22 to 1.97 eV was achieved, which resulted in the extension of photocatalytic activity of TiO2 from UV to Vis regime. The photocatalytic activity and removal rate were approximately two-fold higher than that of the Fe-implanted TiO2 under visible light irradiation. (C) 2011 Elsevier Inc. All rights reserved.
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2011.05.036
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