Nickel sulfide nanometer powdered material with aluminium sulfide casing and preparation method thereof

The invention discloses a nickel sulfide (NiS) nanometer powdered material with an aluminium sulfide (Al2S3) casing and a preparation method thereof, and belongs to the technical field of preparing nanometer materials. The nanometer powdered material is in a core-shell structure, a kernel is an NiS nanometer particle, and the casing is an Al2S3 layer; the particle diameter of the NiS nanometer particle kernel is 10-100 nm, and the Al2S3 casing layer is an amorphous Al2S3 layer of which the thickness is 1-10 nm. According to the invention, a plasma arc discharge method is adopted, according to a certain atomic percent, nickel powder and aluminium powder are pressed into a block which is used as an anode material, a graphite is used as a cathode material, an argon gas and a hydrogen sulfide gas are used as a work gas, a certain distance is kept between a cathode and an anode, and arc discharge is generated between the cathode and the anode, so that the NiS nanometer powdered material with the Al2S3 casing is obtained. The preparation process of the nickel sulfide nanometer powdered material is simple, post-processing working procedures are avoided, and the cost is low, so that industrialized production is easy to realize.