Crystal Structures of Titanate Nanotubes: A Raman Scattering Study

详细信息    查看全文

• 作者：Tao Gao ; Helmer Fjellvå ; g ; Poul Norby
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：February 16, 2009
• 年：2009
• 卷：48
• 期：4
• 页码：1423-1432
• 全文大小：372K
• 年卷期：v.48,no.4(February 16, 2009)
• ISSN：1520-510X

文摘

Crystal structures of titanate nanotubes prepared from a NaOH treatment of TiO₂ with subsequent acid washing were discussed from a viewpoint of vibrational spectroscopy. The correlation between the vibrational feature and the polymerization nature of the TiO₆ octahedron was established by analyzing Raman scattering data of crystalline TiO₂ (anatase and rutile) and layered protonic titanates. Then, the polymerization nature of TiO₆ octahedra in the titanate nanotubes was identified by comparing their Raman scattering spectra with those of the crystalline TiO₂ and layered protonic titanates. It demonstrated that the titanate nanotubes consist of two-dimensional TiO₆ octahedral host layers with a lepidocrocite (γ-FeOOH)-type layered structure. This conclusion was confirmed further by considering the Raman scattering properties of a restacked titanate prepared by assembling TiO₆ octahedral layers derived from the original scroll-like titanate nanotubes. Our findings offered a convenient approach to validate the crystal structures of the products from an alkaline treatment of TiO₂ under different experimental conditions.