Method for using vacuum energy to prepare cavernous body graphene

The invention discloses a method for using vacuum energy to prepare cavernous body graphene. A graphite rod is fed into a reaction chamber in a vacuum reaction still, under a vacuum environment, electric arcs of which the temperature is 10,000-13,000 DEG C are utilized to ionize the graphite rod, and single-layer graphene is obtained in the inner wall area of the reaction chamber. The method is utilized so that single-layer graphene with high purity can be purified and produced in one time under a low voltage and small current condition, the thickness of single-layer graphene is 0.34 nm-1.3 nm, and the size is 4-6 micrometers. The primary finished product obtaining rate exceeds 30%, and the method has the highest one-time raw material purification rate of graphene currently. In the production process, no sewage is drained, the cost is low, the product purity is high, the energy dissipation is low, the performance is excellent, the dispersity is good, and the product is not easily oxidized, and has the feature