▎ 摘　　要

NOVELTY - Preparing ultrathin fluorinated graphene composite lubricating film comprises preparing fluorinated graphene dispersion liquid, adding hydroxide to organic solvent, stirring, adding fluorinated graphite powder, ultrasonically dispersing, evaporating solvent, heating, adding e.g. dispersant, vacuum suction filtration, washing, drying, re-dispersing in water-alcohol mixed solvent, ultrasonically processing, centrifuging to obtain fluorinated graphene dispersion, rotary coating the dispersion on crystalline silicon substrate having upper layer of polydopamine adhesive-buffer layer. USE - The method is useful for preparing ultrathin fluorinated graphene composite lubricating film (claimed). ADVANTAGE - The method: uses simple molten alkali treatment and ultrasonic dispersion method to prepare stable fluoride graphene dispersion liquid; ensures uniform distribution of continuous anti-friction wearable lubricating film; and provides lubrication film with low surface energy and low adhesion rate, exhibiting fluorine content dependence and has antifriction effects and is suitable for non-stick hydrophobic surface engineering. DETAILED DESCRIPTION - Preparing ultrathin fluorinated graphene composite lubricating film comprises (a) preparing fluorinated graphene dispersion liquid, adding hydroxide to organic solvent, stirring, adding fluorinated graphite powder, ultrasonically dispersing to be uniform, taking into an oven until the solvent is evaporated and completely dry, heating the obtained mixture at 180 degrees C for 4 hours, allowing to stand to room temperature, adding water and dispersant into the reaction product, subjecting to vacuum suction filtration, washing to neutral, drying to obtain black powder, re-dispersing black powder in water-alcohol mixed solvent, ultrasonically processing for 5 hours to obtain dispersion liquid, centrifuging to obtain liquid supernatant of fluorinated graphene dispersion, (ii) preparing polydopamine adhesive-buffer layer by taking single crystal silicon substrate, cleaning and modifying by aminosilane treatment, impregnating in previously dissolved dopamine hydrochloride in trihydroxymethyl amino methane buffer liquid of weak alkaline solution, reacting at 25 degrees C for 6-10 hours, where the single crystal silicon substrate is 20 nm thick in the polydopamine adhesive-buffer layer, (iii) taking the product of the step (i), subjecting the substrate having upper layer of polydopamine adhesive-buffer layer to rotary coating with the fluorinated graphene solution.