TY - JOUR
T1 - Nanostructured titanium oxynitride porous thin films as efficient visible-active photocatalysts
AU - Martínez-Ferrero, Eugenia
AU - Sakatani, Yoshiaki
AU - Boissière, Cédric
AU - Grosso, David
AU - Fuertes, Amparo
AU - Fraxedas, Jordi
AU - Sanchez, Clément
PY - 2007/11/5
Y1 - 2007/11/5
N2 - Nanocrystalline mesoporous N-doped titania films have been prepared for the first time. The introduction of nitrogen into the anatase structure starts at 500 °C, with N bonding to titanium via oxygen substitution. Increasing the treatment temperature leads to the formation of TiN (TiN1-xO x) and N-doped rutile showing mixed-valence Ti states. Microstructural characterization shows that the ordered mesoporosity is maintained until 700 °C, where TiN (TiN1-xOx) begins to form. Optical characterization shows that the discrete introduction of N is able to shift the titania absorption edge. The photocatalytic tests give the best results under visible light excitation for the film nitrided at 500 °C. At this temperature the concentration of nitrogen in the structure is optimal since oxygen vacancies are still not important enough to promote the recombination of the photogenerated electrons and holes. © 2007 WILEY-VCH Verlag GmbH & Co. KCaA,.
AB - Nanocrystalline mesoporous N-doped titania films have been prepared for the first time. The introduction of nitrogen into the anatase structure starts at 500 °C, with N bonding to titanium via oxygen substitution. Increasing the treatment temperature leads to the formation of TiN (TiN1-xO x) and N-doped rutile showing mixed-valence Ti states. Microstructural characterization shows that the ordered mesoporosity is maintained until 700 °C, where TiN (TiN1-xOx) begins to form. Optical characterization shows that the discrete introduction of N is able to shift the titania absorption edge. The photocatalytic tests give the best results under visible light excitation for the film nitrided at 500 °C. At this temperature the concentration of nitrogen in the structure is optimal since oxygen vacancies are still not important enough to promote the recombination of the photogenerated electrons and holes. © 2007 WILEY-VCH Verlag GmbH & Co. KCaA,.
U2 - 10.1002/adfm.200700396
DO - 10.1002/adfm.200700396
M3 - Article
VL - 17
SP - 3348
EP - 3354
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 16
ER -