Growth and magnetic properties of two-dimensional vanadium-doped Cr₂S₃ nanosheets

Abstract

Two-dimensional magnetic materials are emerging materials developed in recent years and have attracted much attention for their unique magnetic properties and structural features in single or few layers of atomic thickness. Among them, ferromagnetic materials have a wide range of applications such as information memory and processing. Therefore the current research is mainly focused on enriching the two-dimensional ferromagnetic database and developing modification strategies for magnetic modulation. In this paper, two-dimensional vanadium-doped Cr₂S₃nanosheets were successfully grown on mica substrates by atmospheric pressure chemical vapour deposition. The thickness and size of the nanosheets can be effectively regulated by changing the temperature and mass of vanadium source VCl₃ powders, with the temperature of 765℃ and the mass of 0.010 g as the most appropriate conditions for the growth of nanosheets. The nanosheets were also characterised by optical microscopy, atomic force microscopy, raman spectroscopy, scanning electron microscopy, X-ray energy spectroscopy, X-ray photoelectron spectroscopy, and the nanosheets were regular in shape, with flat surfaces and controllable thicknesses, and high quality vanadium-doped Cr₂S₃ nanosheets were prepared. Meanwhile, the magnetic characterisation of the doped samples showed that the Curie transition temperature of the vanadium doped samples changed to 105 K, and the maximum magnetic moment point of 75 K in the M-T curve disappeared after V doping, and from subferromagnetic to ferromagnetic, and the coercivity in the M-H curve also increased significantly, which proved that the vanadium doping could effectively regulate the magnetic properties of Cr₂S₃ nanosheets. These results are expected to advance the possibility of vanadium-doped Cr₂S₃ materials toward practical applications and become one of the ideal candidate material for next generation spintronic applications.