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Title: Synergistic effect of V/N codoping by ion implantation on the electronic and optical properties of TiO{sub 2}

Performance of the material depends directly on the electronic and energy band structure, to improve the photoactivity of TiO{sub 2} and decrease carrier recombination centers induced by monodoping, the TiO{sub 2} thin film has been modified with V and N codopants by ion implantation for tailing and controlling the electronic structure and energy band structure. Compared to monodopant, codopants of V and N exhibit a synergistic effect in the photoactivity enhancement of TiO{sub 2}. X-ray photoelectron spectroscopy (XPS) studies demonstrate that the implanted V and N ions are introduced into the lattice of TiO{sub 2} through V and N substituting Ti and O, respectively. The electronic structure of V/N codoped TiO{sub 2} was calculated by First-principles calculations based on density-functional theory, the results show the band edges of TiO{sub 2} can be tailored by V and N codopants. UV-vis spectra consistently show the absorption edge of V/N codoped TiO{sub 2} film is widen to visible light region. More importantly, the photoactivity of TiO{sub 2} film has been significantly improved after V/N codoping. The enhanced photocatalytic performance is believed to be due to the V and N codopants induced synergistic effect that not only enhances the absorption of visible light butmore » also promotes the separation of photogenerated electrons and holes in TiO{sub 2}. Besides, there exists an optimum for V/N ions implantation fluence. The capability of improving TiO{sub 2} photoactivity by V/N codoping could open up new opportunities in the development of highly efficient photocatalysts and photoelectrodes for solar energy and environmental applications.« less
Authors:
 [1] ;  [2] ; ;  [3] ; ; ; ; ; ; ; ;  [1] ;  [4] ;  [5] ;  [6]
  1. Department of Physics and Center for Ion Beam Application, Wuhan University, Wuhan 430072 (China)
  2. (China)
  3. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074 (China)
  4. School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068 (China)
  5. Kazan Physical-Technical Institute, Russian Academy of Sciences, Kazan 420029 (Russian Federation)
  6. Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Houston, Texas 77004 (United States)
Publication Date:
OSTI Identifier:
22273604
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; COMPARATIVE EVALUATIONS; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; HOLES; ION IMPLANTATION; NITROGEN IONS; OPTICAL PROPERTIES; PHOTOCATALYSIS; RECOMBINATION; THIN FILMS; TITANIUM OXIDES; ULTRAVIOLET SPECTRA; VANADIUM IONS; VISIBLE RADIATION; VISIBLE SPECTRA; X-RAY PHOTOELECTRON SPECTROSCOPY