▎ 摘　　要

NOVELTY - Preparation of graphene nanometer belt comprises: (i) calcining a carbon nanotube for 1-2 hours at 300-500 degrees C in air and placing into a tubular furnace filled with argon and hydrogen, heating for 1-2 hours at 800-1000 degrees C; (ii) adding concentrated hydraulic acid (12 mol/l) to reflux for 4-5 hours at 100-300 degrees C, filtering and washing to a neutral state and drying at 70-80 degrees C; (iii) mixing an alkali metal with the tube in a mass ratio of 1-3:1, reacting with a solvent by alkaline metal fusion method or electrochemical method; (iv) filtering, washing and drying at 70-100 degrees C to obtain the product. USE - The method is useful for preparing graphene nanometer belt. ADVANTAGE - The method is simple and convenient and is suitable for large-scale production to obtain the graphene nanometer belt with smooth edges and little defects. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the graphene nanometer belt.