Reduced graphene oxide (RGO) nanosheets normally possess large specific surface area, good electrical conductivity, and low density, but their unsatisfactory intrinsic complex permittivity and poor impedance matching severely hinder the further application in microwave adsorption. In this work, borophene nanosheets (BNS), the lightest 2D material, are proposed as an efficient activator to improve the microwave absorbing performance on RGO. BNS are assembled and immobilized on RGO surface through the interfacial covalent interaction, to construct a new metal-free 2D hybrid absorbent. These incorporated BNS serves as the joining site and channel in the framework to facilitate electrons hopping and migration between RGO layers. As a result, conductive loss mechanism is well enhanced, which is the major contribution to its dielectric property, conferring high impedance matching on the absorbent. As expected, the as-obtained 2D metal-free hybrid demonstrates microwave absorbing parameters that approach those of the most active absorbents, with the minimum reflection loss reaching −53.3 dB and the broadest effective absorption bandwidth of 6.16 GHz, at a low filler loading of 3 wt%.

还原的氧化石墨烯（RGO）纳米片通常具有较大的比表面积，良好的电导率和低密度，但是它们不令人满意的固有复数介电常数和较差的阻抗匹配严重阻碍了微波吸附的进一步应用。在这项工作中，最轻的2D材料硼烷纳米片（BNS）被建议作为一种有效的活化剂，以改善RGO上的微波吸收性能。通过界面共价相互作用将BNS组装并固定在RGO表面，以构建新型的无金属2D杂化吸收剂。这些并入的BNS在框架中用作连接位点和通道，以促进电子在RGO层之间跳跃和迁移。结果，导电损耗机制得到了很好的增强，这是对其介电性能的主要贡献，在吸收剂上赋予高阻抗匹配。正如预期的那样，所获得的二维无金属杂化物显示出的微波吸收参数接近最活跃的吸收剂，在低填充量的情况下，最小反射损耗达到-53.3 dB，最有效吸收带宽为6.16 GHz。 3重量％。