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Anodic Fabrication of Highly Ordered {\rm TiO}_{2} Nanotube Arrays and Its Hydrogen Sensing

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4 Author(s)
Ge, Y. ; School of Chemistry and Chemical Engineering, Southeast University, Nanjing, China ; Liu, X. ; Zhu, W. ; Liu, S.

In this paper, highly ordered ${rm TiO}_{2}$ nanotube arrays are fabricated via electrochemical anodization of high purity Ti foil in fluorine containing electrolytes. The field emission scanning electron microscopy measurements show that the morphology of ${rm TiO}_{2}$ nanotube arrays is affected by the two-step anodization process and the polar solvent containing electrolytes. With two-step anodization, the surface morphology of ${rm TiO}_{2}$ nanotube arrays is orderly and uniform. Moreover, the pore diameter is stupendously homogeneous. The structural parameters of ${rm TiO}_{2}$ nanotube arrays were improved by the addition of polar solvent, water, to electrolytes. After annealing treatment and Pd nanoparticle doping, the hydrogen sensing characteristics of ${rm TiO}_{2}$ nanotube arrays were analyzed by measuring its electric resistance response in different ${rm H}_{2}$ concentrations. The results demonstrate that ${rm TiO}_{2}$ nanotube arrays have high hydrogen sensitivity at room temperature.

Published in:

Sensors Journal, IEEE  (Volume:12 ,  Issue: 10 )