Enhanced Visible Light Sensitization of N-Doped TiO2 Nanotubes Containing Ti-Oxynitride Species Fabricated via Electrochemical Anodization of Titanium Nitride
| Autor: | Albert Guirguis, Lingxue Kong, De Ming Zhu, Andrea Merenda, Akshita Rana, Ludovic F. Dumée |
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| Rok vydání: | 2018 |
| Předmět: |
Nanotube
Materials science Nanoporous chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Titanium nitride 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemical state chemistry.chemical_compound General Energy chemistry Chemical engineering X-ray photoelectron spectroscopy Titanium dioxide Photocatalysis Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 123:2189-2201 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The concentration and chemical state of nitrogen represent critical factors to control the band-gap narrowing and the enhancement of visible light harvesting in nitrogen-doped titanium dioxide. In this study, photocatalytic TiO2–N nanoporous structures were fabricated by the electrochemical anodization of titanium nitride sputtered films. Doping was straightforwardly obtained by oxidizing as-sputtered titanium nitride films containing N-metal bonds varying from 7.3 to 18.5% in the Ti matrix. Severe morphological variations into the as-anodized substrates were registered at different nitrogen concentrations and studied by small-angle X-ray scattering. Titanium nitride films with minimum N content of 6.2 atom % N led to a quasi-nanotubular geometry, whereas an increase in N concentration up to 23.8 atom % determined an inhomogeneous, polydispersed distribution of nanotube apertures. The chemical state of nitrogen in the TiO2 matrix was investigated by X-ray photoelectron spectroscopy depth profile analysis ... |
| Databáze: | OpenAIRE |
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