▎ 摘　　要

NOVELTY - Preparing three-dimensional ultralight graphene foam comprises: (a) calibrating the concentration of aqueous graphite oxide solution by adding acrylamide and preparing a homogeneous mixture solution; (b) placing the homogeneous mixture solution in a radiation source chamber with 60cobalt and irradiating gamma -rays at a dose rate to form a three-dimensional graphene composite foam; and (c) lyophilizing the three-dimensional graphene composite foam and isothermally heating the foam under air or an inert gas atmosphere (nitrogen or argon). USE - The process is useful for preparing three-dimensional ultralight graphene foam (claimed). ADVANTAGE - The process is capable of simply and rapidly preparing ultralight three-dimensional graphene foam in single-step with high yield without any toxicity, hence eco-friendly.