Journal
NANOTECHNOLOGY
Volume 23, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/23/235706
Keywords
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Funding
- European Community [247768]
- Italian MIUR through the FIRB [RBAP115AYN]
- CARIPLO Foundation [2008.2393]
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Synthesis of Nb-containing titania nanotubular arrays at room temperature by electrochemical anodization is reported. Crystallization of pure and Nb-doped TiO2 nanotubes was carried out by post-growth annealing at 400 degrees C. The morphology of the tubes obtained was characterized by scanning electron microscopy (SEM). Crystal structure and composition of tubes were investigated by glancing incidence x-ray diffraction (GIXRD) and total reflection x-ray fluorescence (TXRF). For the first time gas sensing characteristics of Nb-doped TiO2 nanotubes were investigated and compared to those of undoped nanotubes. The functional properties of nanotubular arrays towards CO, H-2, NO2, ethanol and acetone were tested in a wide range of operating temperature. The introduction of Nb largely improves conductivity and enhances gas sensing performances of TiO2 nanotubes.
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