Preparation and performance of a bamboo-based electromagnetic wave absorber by interfacial polymerization of graphene oxide/polyaniline

Excellent electromagnetic wave absorption ability and effective absorption bandwidth have been the development direction of electromagnetic wave absorbing materials. In this paper, a rational structural design is proposed. Graphene oxide (GO)/polyaniline (PANI) layer was formed on the surface of the natural material bamboo powder (BP) by an interfacial polymerization process. The combination of GO and PANI improves the impedance mismatch of the conductive polymer PANI. Enhanced dielectric storage and loss capability of the composite GO/PANI/BP. The addition of BP brings more electromagnetic wave loss channels to the composite GO/PANI/BP. This unique structure facilitates the construction of a three-dimensional electromagnetic wave-reflecting cavity, which improves the absorptive capacity of the composite by introducing effective multiple reflections. The conductivity of GO/PANI/BP was 1.78 (+/- 0.06) S/cm. When filled to 30 wt%, a minimum reflection loss (RLmin) of -44 dB at 9.36 GHz and a thickness of 3 mm, and an effective absorption bandwidth (<-10 dB) of up to 5.36 GHz in the frequency range 12.64-18 GHz and at a thickness of 2 mm. Exhibits superior loss capability compared to most previous PANI-based electromagnetic wave absorbing materials. In addition, the design structure of this three-dimensional electromagnetic wave reflecting cavity can provide inspiration for the design of other electromagnetic wave absorbing materials and expands the candidate range of green and efficient electromagnetic wave absorbers.