使用原子力显微镜对氧化石墨烯进行厚度与表面亲水性测试。制备步骤：使用硫酸将2.5cm×2.5cm的硅片进行亲水化处理。将氧化石墨烯与改性氧化石墨烯分散在溶剂（乙醇或水）中，在5000rpm转速下将分散液旋涂在亲水化处理后的硅片上，在室温下风干，进行测试。

Use atomic force microscopy to test the thickness and surface hydrophilicity of graphene oxide. Preparation step: Use sulfuric acid to add 2.5cm × Perform hydrophilic treatment on 2.5cm silicon wafers. Disperse graphene oxide and modified graphene oxide in a solvent (ethanol or water), spin coat the dispersed solution on the hydrophilic treated silicon wafer at 5000rpm, and air dry at room temperature for testing.