电化学阳极氧化自组织TiO2 纳米管阵列的研究

为了弄清阳极氧化制备TiO2纳米管阵列的影响因素及形成机理,研究了HF浓度W(HF)=0.1～1.0%,电压(5V～30V),时间(20min～120min)对阳极氧化TiO2纳米管阵列形貌的影响,用X射线衍射(XRD)和扫描电子显微镜(SEM)对其结构进行表征,并通过电流时间变化曲线探讨了TiO2纳米管阵列的形成机理.结果表明,氧化电压、电解液浓度、氧化时间是影响TiO2纳米管阵列形貌的主要因素,TiO2为不定形结构.只要延长时间,在低浓度W(HF)=0.1%HF溶液中也能得到TiO2纳米管阵列.阳极氧化的整个过程分为3个阶段,纳米管阵列的形成是场增强氧化、场增强氧化膜溶解和HF化学溶解共同作用并达到动态平衡的结果.

Electrochemistry Anodic Oxidation Self2Assembled TiO2 Nanotube Arrays

To ravel the effect factors and the formation mechanism of the anodic oxidation TiO_2 nanotube arrays , the effect of the concentration of HF solution W(HF)=0.1~1.0%, voltage(5~30 V) , time (20 min~120 min) on surface morphology of the TiO_2 nanotube arrays were studied in this paper .The microstructure of the TiO_2 nanotube were characterized by XRD and SEM .The formation mechanism of TiO_2 nanotube arrays were analyzed by current time variety curve . The result show that voltage, electrolyte concentration and oxidation time are the primary factors on the surface morphology of the TiO_2 nanotube arrays which is amorphous phase .After increasing the anodic oxidation time ,TiO_2 nanotube arrays can also be gained in low concentration HF solution W(HF)=0.1%.The whole process of anodic oxidation includes 3 stages ,the formation of TiO_2 nanotube arrays are the result of interaction and dynamic equilibrium with Field-assisted oxidation, Field-assisted dissolution, and HF Chemical dissolution .