▎ 摘　　要

NOVELTY - A metal substrate is placed in acid etching solution, etched metal substrate is heated under anaerobic conditions, surface of metal substrate is subjected to ultraviolet radiation, carbon-containing gas and protective gas are passed and reacted, to obtain carbon nanowall. The carbon nanowall is mixed with metal intercalation agent, placed in vacuum environment and heated, to obtain metal-intercalated carbon nanowall. The metal-intercalated carbon nanowall is mixed with ionic liquid, subjected to ultrasonic treatment and filtered, to obtain graphene nanobelt. USE - Preparation of graphene nanobelt (claimed). ADVANTAGE - The method enables preparation of graphene nanobelt having high electroconductivity. DETAILED DESCRIPTION - A metal substrate is placed in acid etching solution having concentration of 0.01-1 mol/L for 0.5-10 minutes, etched metal substrate is heated at 600-900 degrees C under anaerobic conditions, surface of metal substrate is subjected to ultraviolet radiation, carbon-containing gas and protective gas are passed for 30-300 minutes and reacted, to obtain carbon nanowall. The carbon nanowall is mixed with metal intercalation agent in molar ratio of 1-5:1 under anaerobic conditions, placed in vacuum environment and heated at 200-1000 degrees C for 12-120 hours, to obtain metal-intercalated carbon nanowall. The metal-intercalated carbon nanowall is mixed with ionic liquid in mass-volume ratio of 1 g:10-100 ml, subjected to ultrasonic treatment at 2000-10000 W for 0.5-30 minutes and filtered, to obtain graphene nanobelt. The flow rate of carbon-containing gas is 10-1000 sccm. The ratio of flow rate of carbon-containing gas and protective gas is 2-10:1. The metal intercalation agent is lithium, sodium, magnesium, potassium, calcium, rubidium, strontium and barium.