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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)
Yuhua Ge ; School of Chemistry and Chemical Engineering, Southeast University, Nanjing, China ; Xiaorui Liu ; Wenjing Zhu ; Songqin Liu

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:

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