Forming Mechanism of TiO2 Nanofibres Prepared by Hydrothermal Method

doi:10.3724/SP.J.1077.2008.01075

Abstract

Abstract: The TiO₂ nanofibres with the diameter of φ20-30nm and the length of micron-dimension were successfully synthesized by hydrothermal method. Their crystalline structure, morphology and chemical composition were characterized by the transmission electron microscope (TEM), X-ray diffraction patterns (XRD), infrared spectrum (IR), etc. The forming mechanism of the TiO₂
nanofibres and the effects of pH value in the process of washing on the nanofibres structure were investigated and analyzed, respectively. The results indicate that the forming mechanism of the TiO₂ nanofibres can be described as following: K₂Ti₆O₁₃ nanoparticles are initially formed in alkaline solution using anatase nanoparticles as raw materials, and then gradually
grown to nanofibres along a certain crystalline axis obeyed the dissolution-growth mechanism. The pH value of washing solution has a significant influence on the structure and composition of the products. The nanofibres of K₂Ti₆O₁₃, H₂Ti₃O₇ and TiO₂ can be obtained by the controlling of the pH value of washing solutions and heat-treatment temperature. The products, washed in solution with pH=7 and dried at 80℃, form the nanofibres of H₂Ti₃O₇, which is subsequently calcined to form TiO₂ nanofibres at 400℃.

Key words: hydrothermal method, titanium dioxide, mechanism, nanofibres

CLC Number:

O643

ZHOU Yi,YOU Yang,ZHANG Shi-Ying,WAN Long,XU Di-Fa,KUANG Jia-Cai. Forming Mechanism of TiO₂ Nanofibres Prepared by Hydrothermal Method[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.01075.

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Forming Mechanism of TiO₂ Nanofibres Prepared by Hydrothermal Method

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