【摘要】 随着电子设备电磁干扰和散热问题日益严重，具有高导热和电磁屏蔽功能的复合材料受到广泛关注。以氧化石墨烯为原料，通过旋涂和高温热还原获得了石墨烯薄膜，并采用磁控溅射的方法在薄膜表面镀银，制备了Ag/石墨烯复合薄膜并分析了其结构形貌、导热性能、导电性能及电磁屏蔽性能。结果表明：Ag纳米颗粒均匀地负载到石墨烯薄膜的表面，当Ag纳米镀层的厚度为200 nm时，薄膜的方阻仅为0.02Ω/sq,热导率可达872 W/(m·K),相比单一石墨烯薄膜，复合薄膜在30 MHz～18 GHz频率范围的屏蔽效能提高至37～60 dB。同时，Ag/石墨烯复合薄膜以180°弯曲角进行100次反复弯曲后，屏蔽效能仍可保留85%,展现了良好的机械柔韧性。这些优良性能证明了其在柔性电子设备的电磁兼容和散热领域拥有潜在的应用前景。更多还原

【Abstract】 High thermal conductive materials with excellent electromagnetic interference(EMI) shielding effectiveness(SE) are urgently desirable to eliminate electromagnetic pollution and improve heat-dissipation capacity in electronic devices. Graphene film was prepared by a facile spin-coating method followed by a high-temperature graphitization process. To obtain Ag/graphene composite film(AGCF), Ag nanoparticles were deposited on graphene film using a magnetron sputtering strategy. The structural morphology, thermal/electrical conductivity and EMI shielding performance of the films were characterized and analyzed. The results showed that the graphene film was uniformly decorated by Ag nanoparticles. When the thickness of Ag nano layer reached 200 nm, the square resistance and thermal conductivity of the film were 0.02 Ω/sq and 872 W/(m·K), respectively. Moreover, the EMI SE of AGCF was increased to 37— 60 dB in the frequency of 30 MHz—18 GHz compared with bare graphene film. Meanwhile, the SE still remained 85% of initial value after 100 times of bending with a bending angle of 180°, indicating the excellent flexibility of AGCF. These superior properties make AGCF promising for the application in the field of electromagnetic compatibility and heat dissipation in flexible electronic equipment.更多还原