Study on impedance matching strategy of enhancing microwave absorption performance of nitrogen-doped single-walled carbon nanohorns
Single-walled carbon nanohorns(CNHs)are promising lightweight materials for electromagnetic wave absorption.Their"dahlia-like"structure facilitates multiple scattering and dissipation of electromagnetic waves.To solve the issue of poor X-band absorption performance in CNHs due to impedance mismatch,the dielectric barrier discharge(DBD)plasma with oxygen and nitrogen gas was utilized to optimize the impedance matching of nitrogen-doped single-walled carbon nano-horns(NCNHs).By controlling the amount of surface oxygen functional groups,the absorption performance of NCNHs in the X-band was enhanced.After oxygen DBD treatment,O-NCNHs achieved a minimum reflection loss(RLmin)of-42.93 dB at a thickness of 2.6 mm,with an effective absorption bandwidth(EAB)of 4.14 GHz at a thickness of 1.6 mm.After nitrogen DBD treatment,N-NCNHs exhibited an RLmin of-47.88 dB at a thickness of 2.8 mm,with an EAB of 3.72 GHz at a thick-ness of 1.8 mm.The improvement in absorption performance could be attributed to the impedance matching achieved through DBD treatment and the balance between attenuation capability and impedance matching ability.Specifically,by regulating the amount of surface oxygen functional groups through DBD treatment,NCNHs'impedance matching was im-proved.This study provided a new approach for optimizing impedance matching in high-performance absorbers.
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