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利用自制的锐钛矿相TiO2纳米粉体为反应底物,在浓碱条件下,采用水热方法制备了长度100~200nm,直径约10nm的TiO2纳米管。通过研究碱种类及浓度、水热反应温度、反应时间及清洗方式对产物形貌及物相组成的影响来探究其形成机理。利用TEM及XRD对不同工艺条件下获得产物的形貌及物相组成进行了分析表征。研究表明,TiO2纳米管状结构在水热处理过程中可由部分片状结构自发卷曲而成,酸处理可促进片状结构向管状结构转化。调整清洗溶液的pH值为1时,可直接得到晶型完整的锐钛矿型TiO2纳米管。
TiO2 nanotubes with length of 100 ~ 200nm and diameter of about 10nm were prepared by hydrothermal method using self-made anatase TiO2 nanopowders as reaction substrates. The mechanism of formation was investigated by studying the effect of alkali species and concentration, hydrothermal reaction temperature, reaction time and cleaning method on the morphology and phase composition of the product. The morphology and phase composition of the products obtained under different conditions were characterized by TEM and XRD. The results show that TiO2 nanotubes can be spontaneously curled by some flake structures during the hydrothermal treatment. Acid treatment can promote the transformation of flake structure into tubular structure. When the pH of the cleaning solution is adjusted to 1, anatase-type TiO2 nanotubes with a complete crystal shape can be directly obtained.