▎ 摘　　要

NOVELTY - A nanocomposite lubricating film containing graphene ionic liquid is prepared by taking oxidized graphene as raw material, ultrasonically dispersing to form uniform stable oxidized graphene deionized aqueous dispersion liquid, and fully mixing the oxidized graphene deionized water dispersion liquid and 1-butyl-3-methylimidazolium tetrafluoroborate deionized aqueous solution under ultrasonic dispersion action. USE - Nanocomposite lubricating film containing graphene ionic liquid for microelectro mechanical system micro-devices. ADVANTAGE - The film has higher microfriction bearing capacity of graphene and low micro/nanofriction coefficient of ionic liquid. DETAILED DESCRIPTION - Nanocomposite lubricating film containing graphene ionic liquid, prepared by: (A) taking oxidized graphene as raw material, ultrasonically dispersing to form uniform stable oxidized graphene deionized aqueous dispersion liquid, and fully mixing the oxidized graphene deionized water dispersion liquid and 1-butyl-3-methylimidazolium tetrafluoroborate ((BMIM)(BF4)) deionized aqueous solution under ultrasonic dispersion action; (B) adding 85 wt.% of hydrazine hydrate into mixed solution, stirring in water bath at 80-100 degrees C for 1-5 hours so that the solution is changed to black from yellowish-brown, when the solution is cooled to room temperature, repeatedly cleaning with deionized water, filtering, centrifuging excessive (BMIM)(BF4), and drying the graphene after centrifuging at room temperature; (C) adding the graphene into 1-butyl-3-methylimidazol-3-ium hexafluorophosphate ((BMIM)(PF6)) acetone solution under ultrasonic dispersion action to obtain stable graphene and ionic liquid acetone dispersion liquid; (D) carrying out hydroxylation treatment on surface of monocrystalline silicon piece by 98 wt.% of sulfuric acid and 30 wt.% of hydrogen peroxide; and (E) soaking the hydroxylated monocrystalline silicon piece into the graphene and ionic liquid acetone dispersion liquid by a lifting film coating instrument, and thermally treating in nitrogen environment after soaking.