Meng Xianhui, Lee Tae-Young, Chen Huiyu, Shin Dong-Wook, Kwon Kee-Won, Kwon Sang Jik, Yoo Ji-Beom
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 440-476, Korea.
J Nanosci Nanotechnol. 2010 Jul;10(7):4259-65. doi: 10.1166/jnn.2010.2209.
Large area of self-organized, free standing anodic titanium oxide (ATO) nanotube membranes with clean surfaces were facilely prepared to desired lengths via electrochemical anodization of highly pure Ti sheets in an ethylene glycol electrolyte, with a small amount of NH4F and H2O at 50 V, followed by self-detachment of the ATO membrane from the Ti substrate using recycling processes. In the first anodization step, the nanowire oxide layer existed over the well-arranged ATO nanotube. After sufficiently rinsing with water, the whole ATO layer was removed from the Ti sheet by high pressure N2 gas, and a well-patterned dimple layer with a thickness of about 30 nm existed on the Ti substrate. By using these naturally formed nano-scale pits as templates, in the second and third anodization process, highly ordered, vertically aligned, and free standing ATO membranes with the anodic aluminum oxide (AAO)-like clean surface were obtained. The inter-pore distance and diameter was 154 +/- 2 nm and 91+/- 2 nm, the tube arrays lengths for 25 and 46 hours were 44 and 70 microm, respectively. The present study demonstrates a simple approach to producing high quality, length controllable, large area TiO2 membrane.
通过在含有少量NH4F和H2O的乙二醇电解液中，于50V电压下对高纯钛片进行电化学阳极氧化，可轻松制备出具有清洁表面的大面积自组织、独立的阳极氧化钛（ATO）纳米管膜，并将其制备至所需长度。随后，利用循环工艺使ATO膜从钛基底上自分离。在第一步阳极氧化过程中，纳米线氧化层存在于排列有序的ATO纳米管之上。用水充分冲洗后，通过高压氮气将整个ATO层从钛片上去除，此时钛基底上存在一个厚度约为30nm的图案化凹坑层。以这些自然形成的纳米级凹坑为模板，在第二步和第三步阳极氧化过程中，可获得具有类似阳极氧化铝（AAO）清洁表面的高度有序、垂直排列且独立的ATO膜。其孔间距和直径分别为154±2nm和91±2nm，25小时和46小时的管阵列长度分别为44μm和70μm。本研究展示了一种制备高质量、长度可控的大面积TiO2膜的简单方法。
