Issue 1, 2023

Supercritical CO2-induced room-temperature ferromagnetism in two-dimensional MoO3−x

Abstract

Two-dimensional (2D) magnetic semiconductors are crucial in spin-based information-processing technologies due to the combination of the strong 2D quantum effects, surface effects and the control of spin states. However, most experimental approaches for tuning 2D magnets achieve pure ferromagnetism at low temperature. Herein, a defect engineering strategy using supercritical CO2 is introduced to achieve nanostructure with abundant defects for 2D MoO3−x, and room-temperature ferromagnetism can be obtained and tuned by introduction of the Mo5+ ion depending on the change of supercritical pressure. In defective regions, the presence of the pentacoordinated [Mo5+O5] centers can achieve ferromagnetic ordering resulting in room-temperature ferromagnetism. With increasing supercritical pressure, it is easier for the supercritical CO2 to break the Mo–O bonds, achieving enhancement of the ferromagnetic performance with desired Curie temperature (>380 K). The magnetic responses in the MoO3−x system provide a step closer to the expansion of spin electronics.

Keywords: Supercritical CO2; Room-temperature ferromagnetism; Two-dimensional; MoO3−x.

Graphical abstract: Supercritical CO2-induced room-temperature ferromagnetism in two-dimensional MoO3−x

Supplementary files

Article information

Article type
Paper
Submitted
21 Sep 2022
Accepted
25 Nov 2022
First published
26 Nov 2022
This article is Open Access
Creative Commons BY-NC license

Ind. Chem. Mater., 2023,1, 140-145

Supercritical CO2-induced room-temperature ferromagnetism in two-dimensional MoO3−x

W. Liu and Q. Xu, Ind. Chem. Mater., 2023, 1, 140 DOI: 10.1039/D2IM00028H

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