利用激光烧蚀聚酰亚胺薄膜制备石墨烯材料薄膜,辅助氧等离子体处理制备表面具有更多含氧官能团数量的石墨烯薄膜。采用扫描电子显微镜分析薄膜表面形貌,制备的石墨烯材料具有微孔结构。通过X射线光电子能谱分析石墨烯表面元素含量,经氧等离子体处理后,石墨烯氧含量(原子数分数)达到15.6%。利用接触角测量表征石墨烯薄膜水下疏油性质,在水中薄膜与三氯甲烷液体的接触角约为150°。该方法为大批量制备具有水下疏油特点的石墨烯薄膜提供可行性方案。

Graphene membranes were prepared by laser ablation of polyimide membranes, and the graphene membrane with more oxygen-containing functional groups on surface was prepared by assisted oxygen plasma treatment. A scanning electron microscope was used to analyze the surface morphology of the membrane, and the prepared graphene had porous microstructures. The surface element content of graphene was analyzed by X-ray photoelectron spectroscopy. After oxygen plasma treatment, the oxygen content (atomic fraction) of graphene reached 15.6%. The contact angle measurement was used to characterize the underwater oleophobicity of graphene membranes. The contact angle of trichloromethane underwater was about 150°. This technology provides a feasible strategy for large-scale preparation of graphene membranes with the characteristic of underwater oleophobicity.