Phase Engineering in a Twin‐Phase β/γ‐MoC_x Lightweight Nanoflower with Matched Fermi Level for Enhancing Electron Transport Across the Polarized Interfaces in Electromagnetic Wave Attenuation

Abstract The phase engineering of the polarization interface is of great significance in modifying dielectric loss in electromagnetic wave (EMW) attenuation process, but hard to conduct in a complex hybrid system. Herein, a twin‐phase of β/γ‐MoC_x@CN with matched Fermi level and closed work function properties in lightweight MoC_x nanoflower is constructed, facilitating electron transport withdraw enhanced conductivity and polarization. Moreover, the EMW multiple dissipations among the β/γ‐MoC_x@CN polarization interface is promoted, displaying better matched impedance. It delivered a remarkable minimum reflection loss (RL_min) of −74.2 dB at the thickness of 1.5 mm, which far beyond the single phased β‐MoC_x@CN, γ‐MoC_x@CN and reported MoC_x‐based EMW absorbers. The radar cross‐section (RCS) map of β/γ‐MoC_x@CN is simulated, showing a brilliant maximum reduction value of 13.6 dB m² at the theta angle of 30°. This work presented an excellent sample of atomic‐level manipulation of interfacial polarization in dielectric MoC_x EMW absorption materials.