Graphene oxide (GO) prepared by Hummers’ method possesses many structural defects which decrease its conductivity and limit its application in electromagnetic interference (EMI) shielding. Highly exfoliated GO with less defects (LGO) was prepared by a combination of less oxidant dosage (only 1/3 of the original dosage) and ultrasound-assisted Hummers’ method. The sulfonated reduced LGO (S-rLGO) was compounded with P(St-BA) latex to serve as EMI shielding composite via a blending-casting process. After thermal and chemical reduction, reduced LGO (rLGO) possesses much higher conductivity than reduced GO. With a S-rLGO loading of 25wt%, a high EMI shielding effectiveness (SE) of 15.9 dB at only 0.25 mm is achieved. Meanwhile, the tensile strength of composite is improved by 1097% owing to the π-π interaction. LGO was demonstrated to possess both good structural integrity and exfoliation degree, proving its better potential than GO as precursor of graphene for broad application.

通过Hummers方法制备的氧化石墨烯（GO）具有许多结构缺陷，这些缺陷降低了其导电性并限制了其在电磁干扰（EMI）屏蔽中的应用。通过较少的氧化剂剂量（仅为原始剂量的1/3）和超声辅助悍马法的组合，可以制备出具有较少缺陷的高度剥落的GO（LGO）。磺化的还原型LGO（S-rLGO）与P（St-BA）胶乳混合，通过混合浇铸工艺用作EMI屏蔽复合材料。经过热和化学还原后，还原的LGO（rLGO）具有比还原的GO高得多的电导率。当S-rLGO负载为25wt％时，仅0.25 mm即可实现15.9 dB的高EMI屏蔽效果（SE）。同时，由于π-π相互作用，复合材料的拉伸强度提高了1097％。