Achieving tunability of effective electromagnetic wave absorption between the whole X-band and Ku-band via adjusting PPy loading in SiC nanowires/graphene hybrid foam

By Yehong Cheng, P. Hu, Shanbao Zhou, Liwen Yan, Boqian Sun, Xinghong Zhang, W. Han. Carbon, 2018

146 citations recorded by the source corpus.

Abstract To synthesize lightweight and high-performance electromagnetic wave absorbing composite, SiC nanowire (SiCnw) and conductive polymer polypyrrole (PPy) were incorporated in graphene aerogel (GA) via chemical vapor infiltration combined with a simple chemical polymerization method. The SiCnw/GA with filler loading of 20 wt% has an effective absorption bandwidth of 5.1 GHz in the frequency range of 8.0–13.1 GHz covering the whole X band. After coating on PPy film, the SiCnw/GA-43 wt% PPy sample has an effective absorption bandwidth of 5.9 GHz in frequency range of 12.1–18.0 GHz covering the whole Ku-band at a very thin thickness of 1.83 mm. When adjusting the PPy loading to 66 wt%, the effective absorption bandwidth of SiCnw/GA-PPy could reach a high value of 6.4 GHz in frequency of 8.2–14.6 GHz covering the whole X-band at a thin thickness of 2.32 mm. Therefore, the SiCnw/GA-PPy foams could achieve tunability of effective absorption between the whole X-band and Ku-band by adjusting the loading of PPy or SiCnws. In SiCnw/GA-PPy absorbing materials, interfacial polarization, relaxation polarization loss, electronic dipole polarization and electrons hopping are major determining factors of superior electromagnetic wave absorption properties. The SiCnw/GA-PPy foams with excellent comprehensive performance are promising candidates as electromagnetic wave absorbing materials.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/daf1ff34515382a74027ded687cbcafad307ed70