Net-like SiC@C coaxial nanocable towards superior lightweight and broadband microwave absorber

摘要: Abstract In this study, a practical lightweight and broadband microwave absorber, namely, the net-like amorphous carbon-coated silicon carbide coaxial nanocables (SiC@C NCs), which had low density excellent physicochemical stability, was successfully fabricated according to hydrothermal-carbonization strategy. Typically, absorption performance exhibited broad effective bandwidth (EAB) of up 7.2 GHz (9.12–16.32 GHz) at small matching thickness 2.58 mm. Meanwhile, minimal reflection loss (RL) value −51.53 dB with corresponding EAB across whole Ku-band (11.68–18 GHz) appeared 2.08 mm, suggested that, as-prepared SiC@C NCs displayed extensive application prospects as superior absorber. Moreover, systematic characterization results indicated ascribed interfacial polarization multiple reflections on heterogeneous interface between SiC nanowires (SiC NWs) core carbon shell, together electron Debye dipolar relaxation resulted from stacking faults NWs core, abundant defect disorder within shell.