▎ 摘　　要

NOVELTY - Preparing tunable wettability composite surface comprises (a) ultrasonically cleaning the titanium sheet in absolute ethanol for 5-10 minutes, placing in deionized water for ultrasonic cleaning for 5-10 minutes, blowing with nitrogen for 2-30 minutes, and drying; (b) preparing graphene oxide using Hummer method; (c) drop-coating graphene oxide on the cleaned titanium sheet, and placing on a heating table for 30-40 minutes at 90-95℃; (d) placing the titanium sheet loaded with graphene oxide on the three-dimensional electric translation stage of the femtosecond laser micro-nano processing platform, guiding the laser to the top of the displacement platform, focusing the laser on the surface of the titanium sheet, setting movement parameters of 3D electric translation stage and starting processing to complete femtosecond laser processing; and (e) placing sample in a heating furnace, heating in heating furnace to 100-110℃ in a dark air environment for 24-30 hours. USE - The method is useful for preparing tunable wettability composite surface. ADVANTAGE - The method ensures the heating device has low requirements on device and low energy requirements, and is non-toxic and harmless in the preparation process, and environmentally friendly. The composite surface has excellent photocatalytic performance, and excellent surface contact angle tunability. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic flow chart of the method for preparing tunable wettability composite surface (Drawing includes non-English language text).