使用扫描电子显微镜表征环氧树脂涂层截面的微观结构。制备步骤：环氧化腰果酚与一定量的氧化石墨烯填料混合并搅拌均匀，将混合物与双酚A型环氧树脂复配，用四面制备器刮涂在PET膜上，25℃下固化12小时达到表干，60℃下固化完全。将固化好的涂层从PET膜上剥离，在液氮中脆性断裂得到截面，将涂层截面朝上用导电胶带沾黏在十字样品台侧面，喷金60—120秒使样品表面导电，然后进行测试。

Use scanning electron microscopy to characterize the microstructure of the epoxy resin coating cross-section. Preparation steps: Mix epoxidized cashew nut phenol with a certain amount of graphene oxide filler and stir evenly. Mix the mixture with bisphenol A epoxy resin, and scrape it onto the PET film using a four sided preparator. Cure at 25 ℃ for 12 hours to achieve surface dryness, and cure completely at 60 ℃. Peel the cured coating off the PET film and brittle fracture it in liquid nitrogen to obtain a cross-section. Apply conductive tape to the side of the cross sample table with the coating cross-section facing upwards, spray gold for 60-120 seconds to make the sample surface conductive, and then conduct testing.