石墨烯因具备宽波段高透光性和良好的导电性而有望成为光学窗口的电磁屏蔽材料。采用AuCl3掺杂方式增加少层石墨烯薄膜的载流子浓度, 降低表面电阻值。并通过拉曼光谱对掺杂前后石墨烯薄膜进行表征、对比, 得到石墨烯薄膜层数、缺陷、掺杂类型及连续性方面的信息。利用各向异性介质的平面波传输线模型, 着重考虑化学势对石墨烯电导率的影响, 得到宽波段掺杂石墨烯的屏蔽效能曲线。实验采用屏蔽室法对转移在PET表面的石墨烯薄膜进行屏蔽效能测试, 结果表明寡层(1～2层)掺杂石墨烯的平均屏蔽效能在6.7 dB左右, 与计算值符合较好。

Graphene with high transmittance and great conductivity at wide band is expected to be the electromagnetic shielding materials for optical widows. At present, a large area of monolayer and bi-layer graphene was prepared by the method of chemical vapor deposition (CD). In this way, graphene has low carrier concentration and surface grain boundary effect, which is hard to meet the actual demand of shielding. This paper we use AuCl3 doped graphene to improve carrier concentration and reduce the surface resistance. Using Raman spectroscopy to measure multi points on sample surface, we obtained the situation of intrinsic and doped graphene layers, defects, doping type and continuity. Considering the influence of chemical potential on the graphene conductivity, the shielding effectiveness (SE) can be derived by the anisotropic medium plan wave transmission line model. The experiment which refers to the GJB standard is carried out on the shielding effectiveness of intrinsic and doped graphene. The result suggests that graphene films transferred on PET have average SE at about 6.7 dB, and the theoretical prediction agrees with the measured characteristics well.