Abstract：CoNi/g-C3N4/GQDs ternary nanocapsules were successfully synthesized by two-step liquid chemical method, The morphologies and phase compositions were characterized by XRD, SEM and FT-IR, the electromagnetic properties and microwave absorption properties were carefully studied in 1-18GHz(L–Ku). Experimental results show that the urchins-like CoNi could ensure the permeability on high level. At the same time, the microwave dielectric characteristics could be modulated by the regulation of interfacial dipole and intrinsic dipole with the combination of g-C3N4 and GQDs. In 1-18GHz(L–Ku), the CoNi/g-C3N4/GQDs nanocapsules have greatly improved the electromagnetic impedance and enhanced the microwave absorption properties by means of dielectric modulation, the reflection loss achieves -33.45dB at 12.94GHz with a thickness of 2.4mm, and the effective absorption(RL<-10dB) bandwidth is up to 3.5GHz at the thickness of 2.6mm.
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2021, Vol. 28 