▎ 摘　　要

NOVELTY - Producing pH-sensitive graphene nanostructure, comprises (a) reducing graphene oxide to produce reduced graphene oxide, (b) mixing the reduced graphene oxide with solvent to induce agglomeration of the reduced graphene oxide to produce a porous graphene nanostructure having an open porous structure, and (c) mixing the obtained product with pH-discoloring compound, and bonding the mixture to the porous graphene nanostructure. USE - The method is useful for producing pH-sensitive graphene nanostructure (claimed). DETAILED DESCRIPTION - Producing pH-sensitive graphene nanostructure, comprises (a) reducing graphene oxide to produce reduced graphene oxide, (b) mixing the reduced graphene oxide with a solvent to induce agglomeration of the reduced graphene oxide to produce a porous graphene nanostructure having an open porous structure, and (c) mixing the obtained product with pH-discoloring compound, and bonding the mixture to the porous graphene nanostructure. The step (b) is carried out by aggregating the reduced graphene oxide in solvent to form a porous graphene nanostructure. The solvent is water and/or hydrophilic alcoholic solvent. The pH-discoloring compound is physically: adsorbed on the surface of the porous graphene nanostructure; or bonded on the porous graphene nanostructure through hydrogen bonding. The change resistance value of porous graphene nanostructure is detected according to the external pH change due to the electrical oxidation of the porous graphene nanostructure.