Ultrathin Single-crystalline MgO (111) Nanosheets

23 September 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


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.


2D Materials
High-Energy Surface
CO coupling

Supplementary materials

Ultrathin Single-crystalline MgO (111) Nanosheets SI


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