泡沫钛生长二氧化钛纳米管的制备

Preparation of TiO_2 Nanotubes on Foamed Titanium

研究了泡沫钛孔隙表面生长二氧化钛纳米管的制备方法及二氧化钛纳米管的生长机理。利用与制备多孔陶瓷类似的方式,采用高温真空烧结法制备了多孔泡沫钛镍合金。对该泡沫合金进行了表面改性,通过阳极氧化法在多孔泡沫钛镍合金的孔隙表面生成了二氧化钛纳米管结构。借助于扫描电镜的观测和分析,对该二氧化钛纳米管的生长机理进行了表征和研究,同时考察了阳极氧化电压和时间对二氧化钛纳米管结构形貌的影响。结果发现,电压不变而延长氧化时间,纳米管层的厚度增大;氧化时间不变而提高电压,纳米管之间的分界越明显。

The preparation method and the growth mechanism were studied for TiO2 nanotubes on the surface of foamed titanium. Porous foamed Ti-Ni alloy was prepared by the vacuum sintering at high temperature. The surface of the porous alloy was then modified a nd a layer of TiO2 nanotubes was generated on the surface of the porous foamed Ti-Ni alloy by an anodic oxidation method. The growth mechanism of TiO2 nanotubes was characterized by SEM, and the influences of the anode voltage and the oxidation time on the structure of TiO2 nanotubes were also investigated. The results show that the nanotube layer thickness increases when prolonging the oxidation time at the same voltage, while the boundary among the nanotubes becomes obvious when increasing the voltage with the same oxidation time.