用乳酸溶液为电解质制备TiO_2纳米管阵列

Titania Nanotube Arrays Prepared by Titanium Anodization in Lactic Acid Solution

为了开发自组织阳极氧化制备TiO2纳米管阵列的新体系,以乳酸/NH4F混合溶液为电解质,研究了阳极氧化制备TiO2纳米管阵列的影响因素及形成机理。采用X射线衍射(XRD)和扫描电子显微镜(SEM)对样品进行检测,并通过观察阳极氧化过程中的电流-时间变化曲线,探讨TiO2纳米管阵列的形成机理。结果表明:阳极氧化电压、时间及电解质溶液的黏度是影响TiO2纳米管阵列结构和形貌的主要因素,在40V阳极氧化电压下,制备出平均管径高达180nm的纳米管,所获得的TiO2纳米管阵列为无定型结构,300℃热处理以后转变为锐钛矿型TiO2。

In order to open out a new way to fabricate serf-organization TiO2 nanotube arrays, we studied the influential factors and growth mechanism of graded TiO2 nanotube arrays prepared by the pure Ti anodic oxidation in NH4F/C3HrO3 solution. Titania nanotube arrays were characterized by XRD and SEM. The formation mechanism of titania nanotube arrays was analyzed by the variety curve of current-time. The results show that the electrochemistry parameters including anodizing voltage, duration time and viscosity of the electrolyte are the main factors that effected preparing titania nanotube arrays. Titania nanotube arrays with an inner diameter of about 180 nm and a length of about 500 nm can be grown on the Ti surface in an C3H6O3＋0.35wt% NH4F solution at anodizing voltage of 40 V. After heat treatment of the samples at 300 ℃, titania nanotube arrays were found to be transferred from amorphous to anatase.