Layered CoO2 is of great interest for its promising properties but is meta-stable in its bulk form. CoO2 was synthesized by converting the quasi-one-dimensional crystal structure of bulk Ca3Co2O6 via a hydrothermal treatment. The resulting nanostructures were predominantly nanoscrolls with very thin walls, which exhibit long-term stability. A detailed structural investigation reveals that the CoO2 is found to crystallize in monoclinic form, similar to the related CaCoO2-CoO2 misfit structure. Individual nanoscrolls are characterized electrically and show a p-type semiconducting nature with a high current-carrying capacity of 4⋅105 A cm−2 and an extremely high breakdown voltage of up to 270 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.
@article{arxiv.2309.14533,
title = {Stable CoO$_2$ Nanoscrolls With Outstanding Electrical Properties},
author = {Simon Hettler and Kankona Singha Roy and Raul Arenal and Leela S. Panchakarla},
journal= {arXiv preprint arXiv:2309.14533},
year = {2024}
}