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

Two-dimensional (2D) MXenes demonstrate remarkable potential for next-generation spintronic devices. Nevertheless, the realization and stabilization of robust, room-temperature ferromagnetism in MXene materials remain a fundamental challenge. Conventional approaches for regulating the magnetism of MXenes often lack precise control or result in unstable magnetic states. In this study, a supercritical CO₂- assisted interface engineering strategy was employed to successfully fabricate a novel SC-MoO_3-x/Ti₃C₂T_x MXene heterostructure, which exhibits excellent room-temperature ferromagnetic properties. First-principles calculations indicate that interfacial Ti─O─Mo bonds trigger directional charge transfer from Ti₃C₂T_x to MoO_3-x. This concurrently replenishes Mo 4d orbitals, augmenting ferromagnetism, and creates an electron-deficient state on Ti atoms, which weakens Ti─C bonds and generates intrinsic carbon defects. These defects not only stabilize local spin-polarized states but also act in synergy with the interface-induced charge modulation, further enhancing the overall ferromagnetic response. This study offers atomic and electronic-level insights into the synergistic mechanism between defect engineering and interfacial electronic modulation in 2D MXene systems.