▎ 摘　　要

NOVELTY - Reduced graphene oxide or reduced graphene oxide derivative is prepared by reducing graphene oxide or graphene oxide derivative with a reducing agent at a pH of less than or equal to 4. USE - Preparation of reduced graphene oxide or reduced graphene oxide derivative for ink (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of reduced graphene oxide derivative which involves forming graphene oxide derivative by reacting graphene oxide with a functionalizing compound and reducing the functionalized graphene oxide using a reducing agent.