Neupane Madhav Prasad, Park Il Song, Lee Min Ho, Bae Tae Sung, Watari Fumio
Department of Bionanosystem Engineering, Chonbuk National University, Jeonju, Republic of Korea.
Biomed Mater Eng. 2009;19(1):77-83. doi: 10.3233/BME-2009-0566.
TiO(2) nanotube array (TN) on titanium plate was fabricated by using an electrochemical method. The crystal structure and surface morphology of TN array was examined by X-ray diffraction (XRD) and Field Emission Scanning Electronic Microscopy (FE-SEM), respectively. The stability of the nanotube structure and crystal phase transition was studied at different temperatures in dry oxygen ambient. The as-deposited films were found to be amorphous. The tubes crystallized in the anatase phase at a temperature of 450 degrees C. Anatase crystallites formed inside the tubes walls was transformed completely to rutile at 500 degrees C in dry environment. With the heating temperature increased the intensity of rutile peak increased with decrease in reflection from titanium. Intense rutile peak was observed at 600 degrees C. The average pore diameter as calculated from FE-SEM images was 50-100 nm. At higher temperature tubular structure completely collapsed leaving dense rutile crystallites. A model was proposed to explain the formation mechanism of TN fabricated on titanium plate in HF/H(2)SO(4) electrolyte.
采用电化学方法在钛板上制备了TiO₂纳米管阵列（TN）。分别通过X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）对TN阵列的晶体结构和表面形貌进行了检测。在干燥氧气环境中，研究了不同温度下纳米管结构的稳定性和晶相转变。发现沉积后的薄膜为非晶态。在450℃时，纳米管结晶为锐钛矿相。在干燥环境中，500℃时管壁内形成的锐钛矿微晶完全转变为金红石相。随着加热温度的升高，金红石峰的强度增加，而钛的反射减少。在600℃时观察到强烈的金红石峰。根据FE-SEM图像计算出的平均孔径为50-100nm。在较高温度下，管状结构完全坍塌，留下致密的金红石微晶。提出了一个模型来解释在HF/H₂SO₄电解液中钛板上制备TN的形成机制。
