▎ 摘　　要

NOVELTY - A graphene oxide is mixed with medium containing solid or precursor to obtain mixture. The obtained mixture is heated at 40 degrees C or more to obtain graphene-containing composition. USE - Manufacture of graphene-containing composition used for modification of material e.g. foamed material (both claimed). ADVANTAGE - The method provides graphene-containing composition having excellent hardness, elongation property, gas permeability, thermal property, electrical property, electromagnetic-field property and electroconductivity. The foamed material modified using graphene-containing composition has excellent durability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) heat sensor, which contains graphene oxide and medium. A portion of graphene oxide is transformed into graphene and/or graphene oxide having less amount of functional group, when the heat sensor is exposed to energy source; and (2) modification of material, which involves introducing graphene oxide to a material, and heating at specified temperature which is sufficient to promote transformation of portion of graphene oxide.