Fabrication and EIS Characterization of Titania Nanotube Arrays with Top Non-Tube Layer

Abstract:

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TiO2 nanotube arrays were fabricated in the electrolyte containing 0.25wt% NH4F, 2.5vol% water and the ethylene glycol for various hours at room temperature by anodization of Ti foil in this paper. Some anodized specimens were annealed at 450°C for 3 hours. Electrochemical Impedance Spectroscopy (EIS) was employed to measure electrochemical parameters of anodized specimens. The morphology and crystalline structure of anodized products were characterized by Field Emission Scanning Electronic Microscopy (FESEM), X-ray Diffraction (XRD) and Transmission Electronic Microscopy (TEM). A non-tube layer appears on nanotube arrays with the increase in anodization time. Anodized TiO2 nanotube arrays have an amorphous structure, which transfers to anatase structure after annealing at 450°C. A new equivalent circuit R(CR(R(QR)(CR))) was proposed to fit EIS data. The results show that the charge transfer resistance at the electrode/electrolyte interface controls the electrochemical process of TiO2 nanotubes.

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Periodical:

Edited by:

Enhou Han, Guanghong Lu and Xiaolin Shu

Pages:

350-354

DOI:

10.4028/www.scientific.net/MSF.689.350

Citation:

X. L. Li et al., "Fabrication and EIS Characterization of Titania Nanotube Arrays with Top Non-Tube Layer", Materials Science Forum, Vol. 689, pp. 350-354, 2011

Online since:

June 2011

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$35.00

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