Fibrous Composites with Double-Continuous Conductive Network for Strong Low-Frequency Microwave Absorption

Abstract

Low-frequency electromagnetic absorption is an important issue that has troubled microwave absorbing materials for years. To solve these challenges, fibrous composites with a double-continuous conductive network sustainably derived from natural raw cotton fabrics, Fe3O4 nanoparticles (NPs), and polypyrrole (PPy) films were fabricated from bottom to top. The first level of magnetic fibrous structure is from the inherent raw cotton fabrics and Fe3O4 NPs, while the second level of the double-continuous conductive network is produced by the in situ polymerization of pyrrole monomers and FeCl3. The effect of fibrous pores and double-continuous conductive network endows the fibrous composites with excellent microwave absorption performance. The fibrous composites not only exhibit amazing reflection losses of −67.6 dB at 4.0 GHz and −54 dB at 3.5 GHz respectively, but also exhibit as being lightweight. The developed materials are promising for applications in high-performance stealth aircraft and electromagnetic pollution.