Carbon materials are extensively used in lightweight and efficient microwave absorption (MA) due to their low density. However, the single carbon material has poor impedance matching and absorbing performance. Graphene oxide (GO) and reduced graphene oxide (rGO) are widely used as carbon materials with customizable dielectric properties, but there are still problems of poor MA and high loading. In this work, a series of large-sheet GO with different reduction degrees were prepared by a simple and controlled thermal reduction method, and their MA properties were investigated. The analysis of the composition, structure and MA performance of graphene showed that the MA performance of rGO was closely related to the reduction degree and the size of the sheet. Large sheet graphene was more likely to overlap each other to form a conductive network, reducing the filler loading. Meanwhile, after mixing rGO with different reduction degrees, the optimal reflection loss was −59.12 dB, which was 2.13 times and 1.59 times of the original single component. The effective absorption bandwidth was 3.54 GHz and the loading was only 1.5 wt%. This work provided a promising approach for constructing graphene-based composites with strong MA ability at low filler loadings.

碳材料由于其低密度而被广泛用于轻质且高效的微波吸收（MA）。然而，单一碳材料的阻抗匹配和吸收性能较差。氧化石墨烯（GO）和还原氧化石墨烯（rGO）被广泛用作具有可定制介电性能的碳材料，但仍存在MA差、负载高的问题。本工作通过简单可控的热还原方法制备了一系列不同还原程度的大片GO，并对其MA性能进行了研究。对石墨烯的组成、结构和MA性能的分析表明，rGO的MA性能与还原程度和片材尺寸密切相关。大片石墨烯更容易相互重叠形成导电网络，减少填料负荷。同时，混合不同还原度的rGO后，最佳反射损耗为-59.12 dB，分别是原单组分的2.13倍和1.59倍。有效吸收带宽为 3.54 GHz，负载仅为 1.5 wt%。这项工作为在低填料量下构建具有强 MA 能力的石墨烯基复合材料提供了一种有前景的方法。