2. If it is graphene oxide, it may be an insulator. Due to the special preparation process of strong acid oxidation, there are many defects and functional groups in graphene sheets, which affect the conduction of electrons and phonons, resulting in the decline of electrical conductivity and thermal conductivity. The higher the degree of oxidation, the worse the conductivity.
3. It is also said that graphene is anisotropic, with good electrical conductivity in the vertical direction, but not as bad as insulation. Therefore, it is inaccurate to say that graphene is insulated, and graphene oxide can be insulated.