有机电解液中钛基材表面TiO2纳米管阵列生长机制的研究

Growth Mechanism of TiO2 Nanotube Arrays on Titanium Substrate in Organic Electrolyte

摘要:

采用恒压阳极氧化法在有机电解液（NH4F/甘油、NH4F/乙二醇）中制备TiO2纳米管阵列，研究了阳极氧化电压、时间、电解液成分对纳米管阵列形貌、生长过程的影响，并提出了有机电解液中TiO2纳米管阵列的生长机制。研究表明：有机电解液中，获得纳米管阵列的电压范围更为宽泛，纳米管的生长时间也更长；在不同含水量的有机电解液中，可以制备出形貌不同的纳米管阵列；有机溶剂的高粘度、低含氧量提高了纳米管生长速度的同时控制着纳米管的腐蚀速度，因此在有机电解液中可以制备更大长径比的TiO2纳米管阵列；乙二醇电解液中纳米管的

Abstract:

TiO2 nanotube arrays were prepared by anodic oxidation at a constant potential in organic electrolytes (NH4F/glycerol, NH4F/ethylene glycol). The effects of anodic potential, anodic time and electrolyte composition on the nanotube morphology were investigated. A growth mechanism of TiO2 nanotube arrays in organic electrolytes was proposed. The results indicated that a much wider range of anodic voltage and longer anodic time for the preparation of TiO2 nanotube arrays were required in organic electrolytes. Furthermore, TiO2 nanotube arrays with different morphologies could be fabricated in organic electrolytes with different water contents. The large coefficient of viscosity and the low oxygen content of the organic electrolytes improved the growth velocity of the nanotubes, at the same time controlled their corrosion velocity, resulting in forming longer nanotubes in the electrolytes. Since the growing velocity of nanotube arrays in NH4F/ethylene glycol was bigger than that in NH4F/glycerol, longer nanotubes (64 μm) could be obtained in NH4F/ethylene glycol.