▎ 摘　　要

NOVELTY - Preparing conductive ink comprises (i) preparing oligomer containing cholesterol monomer, and (ii) taking oligomer as dispersant, adding carbon-based material into non-polar solvent, ultrasonically dispersing and concentrating to obtain conductive ink. USE - The method is useful for preparing conductive ink. ADVANTAGE - The ink has high drying rate and characteristics adhesive attraction to the hydrophobic plastic substrate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for A conductive ink prepared by above mentioned method comprising graphene, normal hexane and Am-co-Bn; A preparation method of conductive film comprising coating the conductive ink on the surface of the hydrophobic plastic substrate, drying, forming a conductive film on the surface of the hydrophobic plastic substrate; and A conductive film prepared by above mentioned method, the square resistance of the conductive film is less than 90Ω/sq.