Abstract
We report a simple ultrasonic-assisted ion-exchange/intercalation process that enables unwrapping one-dimensional (1D) titanate nanotubes into two-dimensional (2D) titanate nanosheets. The existence of this 1D to 2D topotactic transformation reveals that the titanate nanotubes could be considered as quasi-2D crystallites with excellent 2D properties such as exfoliation/delamination reactivities although they have the 1D morphology. The resulting titanate nanosheets possess larger band gap energy (∼3.75 eV) than that of the original nanotubes (∼3.30 eV), which might be attributed to the quantum size effect within the 2D titanate nanosheets with small thickness.
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