Advanced electromagnetic wave absorption nanomaterials can play an important role in addressing the issue of increasing electromagnetic pollution in wireless communication field. Herein, a series of coralloid bimetallic Fe0.54Mo0.73/Mo2C@C (FMC)...

The rational design of heterointerfaces has long been a question of great interest in the electromagnetic absorption field.Herein, molybdenum blue/polyaniline/multiwalled carbon nanotubes ({Mo72X30}/PANI/MWCNTs, X=Fe, V) ternary coaxial cable-like fibers are rationally designed and synthesized through host-guest electrostatic and synergistic effect and used as superior electromagnetic wave absorbers for the first time. The coaxial cable-like structure contains extremely rich heterointerfaces between layers, which enhances dipole polarization and interface polarization effect, and modulates conductive loss. Also, the addition of polyoxometalates balances impedance matching and promotes magnetic losses dominated by eddy current losses. The optimal {Mo72V30}/PANI/MWCNTs has superior electromagnetic wave absorption performance (−48.12 dB) at a thinner thickness (2.3 mm). And {Mo72Fe30}/PANI/MWCNTs shows maximum effective absorption bandwidth (6.16 GHz) at the thickness of 2.5 mm. The study not only has gone some way towards enhancing our understanding of the influence of heterointerfaces on electromagnetic absorption, but also highlight the potential usefulness of polyoxometalates functional molecules in electromagnetic wave absorption field.