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arXiv · 2309.14533

Stable CoO$_2$ Nanoscrolls With Outstanding Electrical Properties

Simon Hettler·Kankona Singha Roy·Raul Arenal·Leela S. Panchakarla
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Abstract

Layered CoO$_2$ is of great interest for its promising properties but is meta-stable in its bulk form. CoO$_2$ was synthesized by converting the quasi-one-dimensional crystal structure of bulk Ca$_3$Co$_2$O$_6$ 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 CoO$_2$ is found to crystallize in monoclinic form, similar to the related CaCoO$_2$-CoO$_2$ misfit structure. Individual nanoscrolls are characterized electrically and show a p-type semiconducting nature with a high current-carrying capacity of 4$\cdot$10$^5$ 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.

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Simon Hettler, Kankona Singha Roy, Raul Arenal, Leela S. Panchakarla. 2023-09-25. Stable CoO$_2$ Nanoscrolls With Outstanding Electrical Properties. https://doi.org/10.1002/admi.202400317

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