▎ 摘　　要

NOVELTY - A graphene oxide aqueous suspension is uniformly-dispersed. 0.018-0.040 mmol/mL Aqueous solution of silver nitrate and aqueous suspension of graphite oxide are mixed and ultrasonically-dispersed to form silver ion-graphene oxide colloidal solution. The silver ion-graphene oxide colloidal solution is vacuum filtrated, to obtain silver ion-graphene oxide composite film. The silver ion-graphene oxide composite film is placed in oven and dried. The obtained composite film is placed in tube furnace and heat treated, to obtain nano silver-graphite composite film. USE - Preparation of nano-silver-graphite composite film (claimed). ADVANTAGE - The method enables preparation of nano-silver-graphite composite film having excellent Raman enhancement characteristics. DETAILED DESCRIPTION - A graphene oxide aqueous suspension having concentration 1 mg/mL is uniformly-dispersed. 0.018-0.040 mmol/mL Aqueous solution of silver nitrate and aqueous suspension of graphite oxide in volume ratio of 1:5 are mixed and ultrasonically-dispersed to form silver ion-graphene oxide colloidal solution. The silver ion-graphene oxide colloidal solution is vacuum filtrated, to obtain silver ion-graphene oxide composite film having different thickness. The silver ion-graphene oxide composite film is placed in oven and dried. The obtained composite film is placed in tube furnace at 300-600 degrees C and a mixed gas of hydrogen and argon is supplied and heat treated for 2 hours, to obtain nano silver-graphite composite film. The volume ratio of hydrogen and argon is 1:2.