▎ 摘　　要

NOVELTY - Preparing size-controllable graphene nanobelt, comprises: (a) preparing carbon nanotube array-paraffin wax composite material by heating paraffin to obtain the molten paraffin liquid, then soaking the carbon nanotube array in the liquid, cooling to obtain the block-shaped carbon nanotube array-paraffin wax composite material; (b) preparing oriented carbon nanotube-paraffin wax composite film; and (c) preparing size-controllable graphene nanobelts by baking the composite film to obtain purified carbon nanotube, carrying out heat treatment, and processing in ultrasonic cleaning machine. USE - The method is useful for preparing size-controllable graphene nanobelt. ADVANTAGE - The method is simple and suitable for large scale industrial production. DETAILED DESCRIPTION - Preparing size-controllable graphene nanobelt, comprises: (a) preparing carbon nanotube array-paraffin wax composite material by heating paraffin to obtain the molten paraffin liquid, then soaking the carbon nanotube array in the paraffin liquid for 24 hours, cooling to room temperature to solidify the paraffin and obtain the block-shaped carbon nanotube array-paraffin wax composite material, where the diameter of the carbon nanotube array is 2-200 nm; (b) preparing oriented carbon nanotube-paraffin wax composite film by fixing the block-shaped carbon nanotube array-paraffin wax composite material on a sample holder of semi-thin or ultra-thin slicing machine, ensuring that the orientation direction of the blade is vertical to the carbon nanotube by adjusting the thickness parameter of the slice, and slicing along a direction vertical to the carbon nanotube direction to obtain the vertically-oriented carbon nanotube-paraffin wax composite film of corresponding thickness, where the vertically-oriented carbon nanotube-paraffin wax composite film has a thickness of 20 nm to 500 mu m; and (c) preparing size-controllable graphene nanobelts by baking the vertically-oriented carbon nanotube-paraffin wax composite film in a vacuum oven at 200-500 degrees C constant temperature for 1-24 hours to obtain the purified carbon nanotube, taking out the sample, carrying out heat treatment of the sample in a tubular furnace in an inert gas environment at 700-2000 degrees C for 0.5-5 hours, then dissolving the sample in ethanol or dimethylformamide, processing in an ultrasonic cleaning machine for 1-48 hours, finally volatilizing the solvent to obtain the graphene nanobelt, where the length is 20 nm to 500 mu m, and the width is 6-800 nm.