▎ 摘　　要

NOVELTY - A graphene-based self-assembly multilayer nano lubricating film is prepared by (A) preparing amino silane coupling agent diluted solution; (B) preparing single crystal silicon substrate whose surface is assembled with amino silane coupling agent film; (C) dissolving oxidized graphene in ultra-pure water, ultrasonically dispersing mixture to prepare oxidized graphene diluted solution; (D) preparing single crystal silicon substrate whose surface is assembled with oxidized graphene nano flake; (E) preparing silane molecule diluted solution; and (F) preparing lubricating film. USE - Method for preparation of graphene-based self-assembly multilayer nano lubricating film. ADVANTAGE - The method has simple device, low cost, simple and easy operation during preparation. The prepared lubricating film has excellent combination property with single crystal silicon substrate, and has excellent antifriction and anti-wear property. It solves protection and lubrication problem of material in micro-machine. DETAILED DESCRIPTION - Graphene-based self-assembly multilayer nano lubricating film is prepared by (A) preparing amino silane coupling agent diluted solution; (B) preparing single crystal silicon substrate whose surface is assembled with amino silane coupling agent film; (C) dissolving oxidized graphene in ultra-pure water, ultrasonically dispersing mixture to prepare oxidized graphene diluted solution; (D) preparing single crystal silicon substrate whose surface is assembled with oxidized graphene nano flake; (E) preparing silane molecule diluted solution; and (F) preparing lubricating film. The step (A) comprises selecting amino silane coupling agent and dissolving in mixed solvent comprising acetone and water at vol. ratio of 95:5 to prepare amino silane coupling agent diluted solution. The step (B) comprises soaking single crystal silicon substrate in solution comprising sulfuric acid (H2SO4) and hydrogen peroxide (H2O2) at vol. ratio of 7:3; performing treatment for 0.5-1 hour at 90 degrees C, and using ultra-pure water to ultrasonically wash the product and using nitrogen to blow; soaking product into the prepared amino silane coupling agent diluted solution and standing it for 0.5-1 hour; taking out product and using ultra-pure water to ultrasonically wash; and using nitrogen to blow and obtaining single crystal silicon substrate whose surface is assembled with amino silane coupling agent film. The step (D) comprises soaking single crystal silicon substrate in prepared oxidation graphene diluted solution; and standing mixture for 6-12 hours at 80 degrees C; taking out product, using ultra-pure water to ultrasonically wash, and using nitrogen to blow to obtain single crystal silicon substrate whose surface is assembled with oxidized graphene nano flake. The step (E) comprises selecting silane molecule having low surface energy and dissolving in toluene to prepare silane molecule diluted solution having low surface energy. The step (F) comprises soaking single crystal silicon substrate whose surface is assembled with oxidized graphene in silane molecule diluted solution having low surface energy; standing product for 2-12 hours at room temperature; taking out and processing for 1-2 hours in the environmental atmosphere at 80 degrees C; naturally cooling to room temperature; taking out sample, sequentially and ultrasonically washing sample in toluene, acetone and ultra-pure water for 2 minutes; and using nitrogen to blow to obtain graphene-based self-assembly multi-layer nano lubricating film.