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Title: Fe ion-implanted TiO{sub 2} thin film for efficient visible-light photocatalysis

This work shows the application of metal ion-implantation to realize an efficient second-generation TiO{sub 2} photocatalyst. High fluence Fe{sup +} ions were implanted into thin TiO{sub 2} films and subsequently annealed up to 550 °C. The ion-implantation process modified the TiO{sub 2} pure film, locally lowering its band-gap energy from 3.2 eV to 1.6–1.9 eV, making the material sensitive to visible light. The measured optical band-gap of 1.6–1.9 eV was associated with the presence of effective energy levels in the energy band structure of the titanium dioxide, due to implantation-induced defects. An accurate structural characterization was performed by Rutherford backscattering spectrometry, transmission electron microscopy, Raman spectroscopy, X-ray diffraction, and UV/VIS spectroscopy. The synthesized materials revealed a remarkable photocatalytic efficiency in the degradation of organic compounds in water under visible light irradiation, without the help of any thermal treatments. The photocatalytic activity has been correlated with the amount of defects induced by the ion-implantation process, clarifying the operative physical mechanism. These results can be fruitfully applied for environmental applications of TiO{sub 2}.
Authors:
; ; ;  [1] ; ; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5]
  1. CNR-IMM MATIS, Via S. Sofia 64, 95123 Catania (Italy)
  2. (Italy)
  3. CNR-IMM, Z.I. VIII Strada 5, Catania 95121 (Italy)
  4. Université de Toulouse, CEMES CNRS, 29 rue Marvig, BP 94347, 31055 Toulouse Cedex 4 (France)
  5. Dipartimento di Fisica e Astronomia, Università di Catania, Via S. Sofia 64, 95123 Catania (Italy)
Publication Date:
OSTI Identifier:
22402583
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; EV RANGE; ION IMPLANTATION; IRON IONS; IRRADIATION; PHOTOCATALYSIS; RAMAN SPECTROSCOPY; RUTHERFORD BACKSCATTERING SPECTROSCOPY; THIN FILMS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION