▎ 摘　　要

NOVELTY - Preparing graphene oxide nano-volume comprises (i) preparing graphene oxide sponge by liquid-phase stripping method and freeze-drying method, and ultrasonically dispersing in deionized water to obtain graphene oxide dispersion liquid; and (ii) dropping on a clean substrate, placing horizontally in a device connected to a vacuum pump, and vacuuming to rapidly evaporate water under the condition of normal temperature. USE - The method is useful for preparing graphene oxide nano-volume. ADVANTAGE - The method is convenient for large-scale preparation of various products, economical, simple to operate and has high safety. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene oxide nano-roll composite material, comprises (a) preparing graphene oxide sponge by liquid-phase stripping method and freeze-drying method, and ultrasonically dispersing in deionized water to obtain graphene oxide dispersion liquid, (b) acidifying the carbon nanotubes, washing with deionized water until the pH is neutral, freeze-drying, and ultrasonically dispersing in deionized water to obtain a carbon nanotube dispersion, (c) mixing the graphene oxide dispersion with the carbon nanotube dispersion and ultrasonically processing, (d) dropping on a clean substrate, placing horizontally in a device connected with a vacuum pump and vacuuming to rapidly evaporate water under normal temperature conditions.