Study on titania nanotube arrays prepared by titanium anodization in NH4F/H2SO4 solution
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In this paper, the formation of titania nanotube arrays was investigated in NH4F/H2SO4 electrolyte. Under optimized electrolyte conditions, the titania nanotube arrays with an inner diameter of about 120 nm and a length of about 300 nm was obtained. During the formation process, the variety of current was observed. The current–time curve implied that the evolvement process of titania nanotube arrays include three stages. The stability of titania nanotube arrays at elevated temperatures was studied. The as-prepared titania nanotube arrays is amorphous, crystallized in anatase and rutile as the rising of the temperature. The samples were characterized by ESEM and XRD.
KeywordsRutile Anatase Phase Rutile Phase NH4F Anodize Voltage
The authors would like to thank National Nature Science Foundation of China (30600149), the science research foundation of ministry of Health & United Fujian Provincial Health and Education Project for Tackling the Key Research, P.R. China (WKJ 2005-2-008) and Fujian Development and Reform Commission of China (No. 2004).
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