Layered CoO2β is of great interest for its promising properties but is
meta-stable in its bulk form. CoO2β was synthesized in a long-term stable
nanotubular or scrolled form by converting the quasi-one-dimensional crystal
structure of bulk Ca3βCo2βO6β via a hydrothermal treatment. The resulting
one-dimensional nanostructures with very thin walls are investigated in detail.
The CoO_2 is found to crystallize in monoclinic form, similar to the related
CaCoO2β-CoO2β misfit structure. Individual nanoscrolls are characterized
electrically and show a p-type semiconducting nature with a high
current-carrying capacity of 7.6Γ106 A/cm2 and an extremely high
breakdown voltage of 27 kV/cm. The results demonstrate the possibility to
stabilize meta-stable materials in low-dimensional forms and a promising
application of the nanoscrolls as interconnect in high-voltage electronic
circuitry