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Ultrathin Single-crystalline MgO (111) Nanosheets

preprint
submitted on 22.09.2020 and posted on 23.09.2020 by Pengxin Liu, Paula M. Abdala, Guillaume Goubert, Marc Willinger, Christophe Copéret
Synthesizing high-quality two-dimensional nanomaterials of non-layered metal oxide is a grand challenge because it requires long range single-crystallinity and clean high-energy surfaces. Here, we report the synthesis of single-crystalline MgO(111) nanosheets via a two-step process involving the formation of ultrathin Mg(OH)2 nanosheets as precursor and their selective topotactic conversion upon heating under dynamic vacuum. The defect-rich surface displays terminal -OH groups, 3-coordinated O2- sites, low-coordinated Mg2+ sites as well as single electrons trapped at oxygen vacancies, that render MgO nanosheets highly reactive as evidenced by the activation of CO molecules at low temperatures and pressures, with formation of strongly adsorbed red-shifted CO and coupling of CO molecules into C2 species.

Funding

ETHZ Postdoctoral Fellowship Program and the Marie Curie Actions for People COFUND Program.

History

Email Address of Submitting Author

pengxin@inorg.chem.ethz.ch

Institution

ETHz

Country

Switzerland

ORCID For Submitting Author

0000-0002-2332-4652

Declaration of Conflict of Interest

Authors declare no competing interests.

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