Abstract: The design of multifunctional electromagnetic wave-absorbing materials with strong absorption capacity and wide absorption bandwidth is the trend of the next-generation communication technology. Reduced graphene oxide (rGO) aerogels have been widely used in electromagnetic wave-absorbing research due to the porous structure, low density and excellent conductive network. However, pure rGO aerogel shows the problem of impedance mismatching, which is usually used with other materials. Metal-polyphenol farmwork has the advantages of abundant sources, environmental friendliness, and low cost. It also has strong adhesion ability and abundant dipole polarization groups, which can increase the roughness of rGO and improve its electromagnetic wave absorption performance. In this work, Co2+-tannic acid (Co2+-TA) nanorods were assembled into rGO skeleton by in-situ growth and hydrothermal reduction, and then the porous structures were constructed by freeze-drying. The prepared rGO/Co2+-TA aerogels exhibit strong wave-absorbing properties, achieving a minimum reflection loss of -64.21 dB and an effective absorption bandwidth of 6.16 GHz at a filling ratio of only 8wt%. The excellent wave-absorption performance can be attributed to the multiple reflections and scattering of the porous structure, the moderate resistance loss of the rGO skeleton, and the interfacial polarization loss and dipole polarization loss of the Co2+-TA nanorods. In addition, the Co2+-TA nanorod-modified rGO aerogel showed low density (0.03 g/cm3), hydrophobicity (water contact angle: 139.4°), and thermal insulation (temperature difference of 64 ℃). This work provides ideas for the design and synthesis of multifunctional and efficient wave-absorbing materials.
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2025, Vol. 39 
