Nanotube formation from a sodium titanate powder via low-temperature acid treatment

Chien Cheng Tsai, Hsisheng Teng

研究成果: Article同行評審

61 引文 斯高帕斯(Scopus)

摘要

Through structure-monitoring of nanotube formation from a lamellar sodium titanate, the present work explicitly elucidated the structure of the titanate nanotubes obtained from hydrothermal treatment of TiO2 with NaOH. A new compound of an orthorhombic lepidocrocite-type sodium titanate was synthesized from calcination of a solid-state mixture of TiO2 anatase and Na2CO3 powders followed by hydrothermal treatment with NaOH. By treating with acid at 25°C for Na+ exchange with H3O+, the titanate compound exfoliated and then proceeded with sheet-scrolling to form nanotubes, which had a structure and morphology very close to those of the nanotubes derived from NaOH treatment on TiO 2. During the low-temperature acid treatment, the lepidocrocite-type titanate is transformed from the orthorhombic C-base-centered symmetry to the body-centered symmetry. This transformation, accompanied by a size-contraction of TiO6-octahedron units, was critical for the formation of nanotubes. The present work provides direct evidence, for the first time, that the widely reported TiO2-derived titanate nanotubes can be obtained at low temperatures by scrolling the sheets exfoliated from the orthorhombic lepidocrocite-type titanate.

原文English
頁(從 - 到)3434-3438
頁數5
期刊Langmuir
24
發行號7
DOIs
出版狀態Published - 2008 4月 1

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學
  • 表面和介面
  • 光譜
  • 電化學

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