Abstract
We report a process directly transforming 2D nanosheets into 1D nanotubes. Using unilamellar nanosheets as starting materials, we succeeded in obtaining titanium oxide, manganese oxide, and niobate nanotubes (15−60 nm in diameter). The transformation was achieved in a simple procedure of an ion intercalation/deintercalation procedure at ambient temperature. The intercalation of Na ions leads to stacking up of the colloidal nanosheets. The gradual deintercalation/extraction of Na ions in water changes the inter-sheet bonding character. The peeled off nanosheets naturally roll up into nanotubes. It is most likely to be a universal process and has outstanding potential in customized syntheses of nanotubes from a wide range of lamellar solids.
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