使用Cu助剂在常压及Cu-Ti共晶温度下快速制备TiO2纳米线

本文提供了一种简单的热退火方法以制备线状TiO2纳米结构。热退火方法一直难以用于高熔点金属氧化物纳米结构的制备,而本文通过引入CuCl2作为催化剂,通过简单的反应过程,在较短的时间内和远低于钛熔点的反应温度下制得了金红石相的TiO2一维纳米结构。研究结果表明,关键的实验参数包括活性催化物添加量、生长温度和退火时间。在850℃(接近于Cu-Ti共晶温度)退火60分钟的反应条件下,制备的二氧化钛纳米线长度在10微米以上,直径约为100纳米。此外,本文还探讨了TiO2纳米线生长机理。

Cu-assisted Fast Synthesis of TiO2 Nanowires in Ambient Pressure under Cu-Ti Eutectic Temperature

Titanium dioxide nanostructures were synthesized by using a simple thermal annealing method,which has often been avoided for the synthesis of metal-oxide nanostructures from high-melting point metals such as Ti.The synthesis method introduced in this paper requires neither high reaction temperature nor complicated reaction processes,and can be used for producing dense TiO₂ nanomaterials with relatively short reaction time at temperatures much lower than the melting point of titanium.Key synthesis parameters,including amount of eutectic catalyst,growth temperature and annealing time,were systematically investigated by varying the growth conditions.A copper eutectic catalyst was used in synthesis reaction,producing long nanostructures with short reaction times.It was observed that after annealing for 60 minutes at 850℃（close to the eutectic temperature of Cu-Ti）,～10 μm long rutile TiO₂ nanowires with diameters of ～100nm were densely produced.Moreover,the growth mechanism of the nanowires is also proposed.