2D Amorphous MoO_3-x/Ti₃C₂T_x MXene Heterostructure: Interface Charge Transfer-Induced Carbon Defect-Driven Enhancement...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) MXenes show promise for spintronics.
• Achieving stable room-temperature ferromagnetism in MXenes is a significant challenge.
• Existing methods for magnetic control in MXenes are often imprecise or yield unstable results.

Purpose of the Study:

• To engineer a novel MXene heterostructure with robust room-temperature ferromagnetism.
• To investigate the underlying mechanisms responsible for enhanced magnetic properties.
• To offer atomic and electronic insights into defect and interface engineering in 2D materials.

Main Methods:

• Fabrication of SC-MoO3-x/Ti3C2Tx MXene heterostructure using supercritical CO2-assisted interface engineering.
• First-principles calculations to analyze interfacial bonding, charge transfer, and defect formation.
• Investigation of electronic structure and spin polarization.

Main Results:

• The novel heterostructure exhibits excellent room-temperature ferromagnetic properties.
• Interfacial Ti-O-Mo bonds facilitate charge transfer, enhancing Mo 4d orbital ferromagnetism.
• Intrinsic carbon defects are generated, stabilizing spin-polarized states and boosting ferromagnetism.

Conclusions:

• Supercritical CO2-assisted interface engineering is an effective strategy for developing ferromagnetic MXenes.
• A synergistic mechanism involving interfacial charge modulation and defect engineering enhances ferromagnetism.
• The findings provide a pathway for designing next-generation spintronic materials based on 2D MXenes.