ACS applied materials & interfaces: Intrinsic room temperature ferromagnetism of V2C MXene nanosheets

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Two-dimensional materials with intrinsic magnetism have received extensive attention due to their potential applications in low-power electronics and spintronics. So far, only a few intrinsically magnetic two-dimensional materials have been reported. Here, we report the intrinsic ferromagnetic behavior of two-dimensional V2C MXene nanosheets through layer mismatch engineering. At room temperature, the V2C MXene nanosheets twisted at a small angle have a stable intrinsic ferromagnetic response, and the saturation magnetic moment is 0.013 emu/g. Through X-ray absorption spectroscopy, electron paramagnetic resonance (EPR) and photoelectron spectroscopy analysis, it has been studied in depth. The results show that the interlayer symmetrical fracture torsion reduces the degeneracy of the v3d state and the van Hove singularity. This leads to a redistribution of the electron density of states near the Fermi level, and thus activates Stonener ferromagnetism and an improved flowing electron density d. This work highlights the potential application prospects of V2C MXene as an intrinsic room temperature ferromagnetic material in spintronics or spin-based electronics.

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Figure 1. (a) Schematic diagram of the preparation of V2C MXene ultra-thin nanosheets. (b) SEM image of undistorted ML V2C MXene. (c) TEM image of undistorted ML V2C MXene. The inset is an HRTEM cross-sectional image of the undistorted ML V2C MXene. (d) SAED graphics of the surrounding area in (c). (e) AFM image of V2C MXene nanosheets. (f) TEM image of V2C MXene nanosheets (the inset is a cross-sectional TEM image). (g) HRTEM image of V2C MXene nanosheets.

Figure 2. (a) Select the SAED image of the V2C MXene nanosheet from the nanosheet area in the illustration. (i) Angle distribution histogram of V2C MXene nanosheets. (j, k) Select HRTEM images of the same position and different focal planes from (f). (l) (j) and (k) merge images.

Figure 3. (a) Hysteresis loops of non-twisted ML V2C MXene and twisted V2C MXene nanosheets at 300k. (b) The relationship between ZFC and FC magnetization of non-twisted ML V2C MXene and (c) twisted V2C MXene nanosheets with temperature.