Journal
NANO TODAY
Volume 40, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2021.101272
Keywords
supercritical CO2; phase engineering; 2D ferromagnet; non-van der Waals; VO2
Categories
Funding
- National Natural Science Foundation of China [51173170, 21571157, 21703207, 21773216]
- China-National Natural Science Foundations [U2004208]
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A new method for preparing 2D ferromagnetic materials has been developed through a CO2-induced phase engineering strategy, which involves infiltrating and swelling the material at the molecular scale, and then plasticizing the VO2 solid at the architectural scale to form a 2D defective network.
Two-dimensional (2D) ferromagnetic semiconductors that combine ferromagnetic order with desirable physical attributes could find transformative applications in atomically-thin magneto-optical and magnetoelectric devices. The mainstream strategies of creating magnetic moments in 2D materials are introducing charge carriers. Here we introduce a CO2-induced phase engineering strategy that achieves 2D ferromagnet via the transformation of non-van der Waals (non-vdW) VO2 solid to 2D defective structure with identified metastable phases. Our approach requires only exposing the structure to supercritical CO2 liquid that is able to first infiltrate and swell the material at the molecular scale, and then plasticize VO2 solid at the architectural scale to form a 2D defective network that 'lock' the metastable phases into a new topological structure, which would lead to a significantly enhanced ferromagnetic response. We attribute the phase transformation to the CO2 pressure-induced selective cleavage of covalent bond. (C) 2021 Elsevier Ltd. All rights reserved.
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