Preparation method of crystalline red phosphorus sheet

The invention belongs to the technical field of functional materials, and particularly relates to a preparation method of a crystalline red phosphorus sheet. The method comprises the following steps: loading raw materials of amorphous red phosphorus, iodine and tin into one end of a reactor according to a mass ratio, and placing a target substrate with a proper size at the other end; heating and sealing the reactor in vacuum; and placing the reactor horizontally in a heating furnace, raising the temperature to a set temperature, conducting heat preservation, then lowering the temperature to room temperature, and preparing the crystalline red phosphorus sheet successfully on the target substrate. The invention provides the method for directly preparing the crystalline red phosphorus sheet on the substrate for the first time; commercial amorphous red phosphorus is used as a raw material and is easy to obtain, and the production cost is low; and the crystalline state red phosphorus sheet prepared by the method i