▎ 摘　　要

NOVELTY - A metal substrate is subjected to acid treatment, and acid-treated substrate is placed in oxygen-free environment. Carbon-containing substance and protective gas are passed to reactor, and a metal substrate is attached on the surface of carbon nanowall. The metal substrate and carbon nanowall are separated to obtain carbon nanowall powder. Carbon nanowall powder and metal chloride are mixed to obtain metal chloride-intercalated carbon nanowall. Acetone is added to metal chloride-intercalated carbon nanowall and alternating electric field is applied to obtain graphene nanobelt. USE - Preparation of graphene nanobelt (claimed). ADVANTAGE - The method provides graphene nanobelt having controlled size. DETAILED DESCRIPTION - A metal substrate is subjected to acid treatment, acid-treated metal substrate is placed in oxygen-free environment and heated to 600-900 degrees C. Carbon-containing substance is passed to chemical vapor deposition reactor, protective gas is passed to the reactor under UV irradiation, and a metal substrate is attached on the surface of carbon nanowall. The metal substrate and carbon nanowall are separated to obtain carbon nanowall powder. Carbon nanowall powder and metal chloride are mixed in a mass ratio of 1:0.8-1:1.2, and reacted at 460-550 degrees C to obtain metal chloride-intercalated carbon nanowall. Acetone is added to metal chloride-intercalated carbon nanowall, an alternating electric field is applied with electric field strength of 50-5000 V/m and frequency of 10-1000 Hz, separated and purified to obtain graphene nanobelt. The mass-volume ratio of metal chloride-intercalated carbon nanowall to acetone is 1g:100-1000ml.