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以价廉的Ni板代替常用的Pt片为阴极,纯钛为阳极,采用电化学阳极氧化法在NH4F-H3PO4体系中制备出TiO2纳米管阵列。详细研究了制备参数(溶液酸度、氟离子浓度、外加电压和氧化时间)对所获纳米管阵列形貌的影响。采用场发射扫描电镜(FE-SEM)和X射线衍射(XRD)对样品的形貌和晶相结构进行了表征。在最优化的条件下,可以获得形貌规整、表面干净、有序的TiO2纳米管阵列。纳米管阵列的平均管径为60nm,管长约530nm。采用阳极氧化法制备的纳米管阵列是非晶态的,经400℃热处理2h后,可以转变为锐钛矿相。实验结果还发现,经过热处理后,纳米管阵列变得更为有序,管径扩大至约95nm。
The cheap Ni plate instead of the common Pt sheet as the cathode, pure titanium as the anode, the use of electrochemical anodization in NH4F-H3PO4 system prepared TiO2 nanotube array. The effects of preparation parameters (solution acidity, fluoride ion concentration, applied voltage and oxidation time) on the nanotube array morphology were investigated in detail. The morphology and crystal structure of the samples were characterized by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). Under optimized conditions, the nanotube array with regular morphology, clean surface and ordered structure can be obtained. The average tube diameter of the nanotube array is 60 nm and the tube length is about 530 nm. The nanotube array prepared by anodic oxidation is amorphous, which can be transformed into anatase phase after heat treatment at 400 ℃ for 2h. The experimental results also found that after heat treatment, nanotube arrays become more orderly and the diameter of the nanotube increases to about 95 nm.