Structural and chemical mechanisms governing stability of inorganic Janus nanotubes

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Abstract

One-dimensional inorganic nanotubes hold promise for technological applications due to their distinct physical/chemical properties, but so far advancements have been hampered by difficulties in producing single-wall nanotubes with a well-defined radius. In this work we investigate, based on Density Functional Theory (DFT), the formation mechanism of 135 different inorganic nanotubes formed by the intrinsic self-rolling driving force found in asymmetric 2D Janus sheets. We show that for isovalent Janus sheets, the lattice mismatch between inner and outer atomic layers is the driving force behind the nanotube formation, while in the non-isovalent case it is governed by the difference in chemical bond strength of the inner and outer layer leading to steric effects. From our pool of candidate structures we have identified more than 100 tubes with a preferred radius below 35 Å, which we hypothesize can display distinctive properties compared to their parent 2D monolayers. Simple descriptors have been identified to accelerate the discovery of small-radius tubes and a Bayesian regression approach has been implemented to assess the uncertainty in our predictions on the radius.

Original languageEnglish
Article number41
Journalnpj Computational Materials
Volume7
Issue number1
Number of pages8
ISSN2057-3960
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
The authors thank Prof. Poul Norby for the valuable discussion on the possible synthesis pathways of the investigated tubes. The authors acknowledge support from the Department of Energy Conversion and Storage, Technical University of Denmark, through the Special Competence Initiative Autonomous Materials Discovery (AiMade—http://aimade.org/). KST acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 773122, LIMA).

Publisher Copyright:
© 2021, The Author(s).

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