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This invention belongs to the field of two-dimensional materials technology, specifically relating to a VS 2x Se 2(1‑x) A method for preparing two-dimensional alloy materials with controllable work function involves placing VCl3, Se powder, and S powder in a weight ratio of 1–3:9–11:1 in the high-temperature, medium-temperature, and low-temperature zones of a vapor deposition tube, respectively. Heating in each zone causes the raw materials to volatilize and chemically deposit on the substrate surface under the transport of a carrier gas. During this process, the alloy composition of the chemically deposited product is controlled by adjusting the temperature in the low-temperature zone, thereby controlling the work function of the product and obtaining VCl3 alloys with different work functions. 2x Se 2(1‑x) Alloy two-dimensional materials; where, 0