▎ 摘　　要

NOVELTY - Water suspension comprises 100-500 mu g/ml graphene oxide nanoflakes, and 5-50 mu g/ml nanoparticles of metallic platinum, deposited on the surface of graphene oxide nanoflakes. USE - The water suspension is useful as an antitumor agent against human or animal tumors (all claimed). ADVANTAGE - The water suspension does not induce inflammation, irritation and any other toxic side effects, and excludes possibility of creating toxic compounds in bloodstream and of interacting with other medicines used collaterally in chemotherapy. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the water suspension, which involves combining a pure suspension of graphene oxide in water with a pure colloidal solution of metallic platinum in water, with optional stirring, treating the mixture by an ultrasonication process in an ultrasound bath for 30-60 minutes, preferably 45 minutes.