This work shows the application of metal ion-implantation to realize an efficient second-generation TiO2 photocatalyst. High fluence Fe+ ions were implanted into thin TiO2 films and subsequently annealed up to 550 °C. The ion-implantation process modified the TiO2 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 TiO2.
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7 November 2014
Research Article|
November 06 2014
Fe ion-implanted TiO2 thin film for efficient visible-light photocatalysis
G. Impellizzeri;
G. Impellizzeri
a)
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
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V. Scuderi;
V. Scuderi
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
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L. Romano;
L. Romano
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
2Dipartimento di Fisica e Astronomia,
Università di Catania
, Via S. Sofia 64, 95123 Catania, Italy
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P. M. Sberna;
P. M. Sberna
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
2Dipartimento di Fisica e Astronomia,
Università di Catania
, Via S. Sofia 64, 95123 Catania, Italy
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E. Arcadipane;
E. Arcadipane
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
2Dipartimento di Fisica e Astronomia,
Università di Catania
, Via S. Sofia 64, 95123 Catania, Italy
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R. Sanz
;
R. Sanz
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
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M. Scuderi;
M. Scuderi
3
CNR-IMM
, Z.I. VIII Strada 5, Catania 95121, Italy
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G. Nicotra;
G. Nicotra
3
CNR-IMM
, Z.I. VIII Strada 5, Catania 95121, Italy
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M. Bayle;
M. Bayle
4
Université de Toulouse
, CEMES CNRS, 29 rue Marvig, BP 94347, 31055 Toulouse Cedex 4, France
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R. Carles;
R. Carles
4
Université de Toulouse
, CEMES CNRS, 29 rue Marvig, BP 94347, 31055 Toulouse Cedex 4, France
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F. Simone;
F. Simone
2Dipartimento di Fisica e Astronomia,
Università di Catania
, Via S. Sofia 64, 95123 Catania, Italy
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V. Privitera
V. Privitera
1
CNR-IMM MATIS
, Via S. Sofia 64, 95123 Catania, Italy
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a)
Author to whom correspondence should be addressed. Electronic mail: giuliana.impellizzeri@ct.infn.it
J. Appl. Phys. 116, 173507 (2014)
Article history
Received:
September 23 2014
Accepted:
October 25 2014
Citation
G. Impellizzeri, V. Scuderi, L. Romano, P. M. Sberna, E. Arcadipane, R. Sanz, M. Scuderi, G. Nicotra, M. Bayle, R. Carles, F. Simone, V. Privitera; Fe ion-implanted TiO2 thin film for efficient visible-light photocatalysis. J. Appl. Phys. 7 November 2014; 116 (17): 173507. https://doi.org/10.1063/1.4901208
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