Natural rutile-derived titanate nanofibers prepared by direct hydrothermal processing
Natural rutile-derived titanate nanofibers prepared by direct hydrothermal processing
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DOI：
10.1557/jmr.2005.0135
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发表时间：
2005-04
影响因子：
2.7
通讯作者：
Yoshikazu Suzuki;S. Pavasupree;S. Yoshikawa;Ryoji Kawahata
中科院分区：
文献类型：
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作者：
Yoshikazu Suzuki;S. Pavasupree;S. Yoshikawa;Ryoji Kawahata
以天然金红石为原料，采用直接水热法成功地制备了长的钛酸盐纳米纤维（通常长度为10-500 μm，直径为20-50 nm）。傅里叶变换红外光谱、透射电子显微镜、能量色散x射线光谱、电子衍射和x射线衍射表明，合成的纳米纤维可能由三钛酸氢钠[（Na，H）_2Ti_3O_7，例如，Na_0.4H_1.6Ti_3O_7]中含有六钛酸盐型缺陷[（Na，H）_2Ti_6O_13]。部分拓扑结构的缩合模型解释了它们的纳米结构。虽然合成的纤维是有缺陷的，但它们可以通过在空气中进行后热处理来固化。天然金红石的直接水热处理不仅可以作为反应步骤，而且可以作为纯化步骤，是一种很有前途的低成本一维纳米材料制备方法。
Long titanate nanofibers (typically 10–500 µm in length and 20–50 nm in diameter) were successfully prepared in high yield by the direct hydrothermal processing using natural rutile as a starting material. Fourier transform infrared spectroscopy, transmission electron microscopy, energy dispersive x-ray spectroscopy, electron diffraction, and x-ray diffraction demonstrated that the as-synthesized nanofibers presumably consisted of sodium hydrogen trititanate [(Na,H)_2Ti_3O_7, e.g., Na_0.4H_1.6Ti_3O_7] including some hexatitanate-type defects [(Na,H)_2Ti_6O_13]. A partial topotactic condensation model explained their nanostructure well. Although the as-synthesized fibers are defective, they can be cured by a post-heat-treatment in air. The direct hydrothermal treatment for natural rutile will be a promising low-cost process for one-dimensional nanomaterials, which can act not only as a reaction step but also as a purification step.