Fig. 1. Test of the hydrophobicity of lotus leaf. (a) Photograph; (b) static contact angle; (c) CLSM image; (d) SEM image (50μm); (e) SEM image (10μm)

Fig. 2. Laser processing of PVDF. (a) Laser processing system; (b) schematic diagram of laser processing PVDF; (c) surface of PVDF film; (d) surface of L-PVDF film

Fig. 3. SEM images of the surface of PVDF and L-PVDF films. (a)--(b) PVDF films; (c)--(f) L-PVDF films

Fig. 4. XPS spectrum of PVDF. (a) PVDF film; (b) XPS broad spectrum of L-PVDF film surface; (c) PVDF film; (d) C1s spectrum of L-PVDF film surface

Fig. 5. Test of the static contact angle. (a) Surface static contact angle under different processing power; (b) stability test of the surface static contact angle