Abstract
The fabrication and applications of superhydrophobic surfaces (contact angle >150°,sliding angle <10°) have attracted worldwide interest with respect to materials and devices. In this work, the laser-induced graphene (LIG) superhydrophobic surface transition from pinning to rolling via an extremely simple solvent treatment of LIG in air is reported. By adding a certain solvent (e.g., ethanol) to the surface, the LIG superhydrophobic surface changes from pinning (sliding angle = 180°) to rolling (sliding angle <6°), which is attributed to the chemically changed surface properties and surface morphology of LIG. Three applications are demonstrated with the developed superhydrophobic LIG, including surface-enhanced Raman spectroscopy, water-oil separation, and anti-icing.
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