阻抗匹配策略提升氮掺杂单壁碳纳米角吸波性能研究  

Study on impedance matching strategy of enhancing microwave absorption performance of nitrogen-doped single-walled carbon nanohorns

作　　者：刘轶昌 解志鹏 刘云峰 张达[1,2] 梁风 LIU Yichang;XIE Zhipeng;LIU Yunfeng;ZHANG Da;LIANG Feng(National Engineering Research Center of Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;The Military Representative Bureau in Chongqing of the Army Equipment Department,Qujing 655000,China)

机构地区：[1]昆明理工大学真空冶金国家工程研究中心,云南昆明650093 [2]昆明理工大学冶金与能源工程学院,云南昆明650093 [3]陆军装备部驻重庆地区军事代表局,云南曲靖655000

出　　处：《无机盐工业》2024年第12期29-34,共6页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(12175089,12205127);云南省重点研发计划项目(202103AF140006);云南省“兴滇人才支持计划”产业创新人才项目(KKXY202252001)。

摘　　要：单壁碳纳米角(single-walled carbon nanohorns,CNHs)是一种有潜力的轻质电磁波吸收材料。其“大丽花”状结构有益于电磁波的多重散射耗散。针对CNHs因为阻抗失配所导致的X波段吸波性能不佳的问题,研究使用氧气和氮气介质阻挡放电(dielectric barrier discharge,DBD)等离子体对“大丽花”状结构的氮掺杂单壁碳纳米角(nitrogen doped single-walled carbon nanohorns,NCNHs)进行阻抗匹配优化。得益于对表面含氧基团的含量调控,NCNHs在X波段的吸波性能得到了提升。经过氧气DBD处理,在厚度为2.6 mm时O-NCNHs的反射损失峰值(minimum of reflection loss,RL_(min))可达-42.93 dB,在厚度为1.6 mm时有效吸收频宽(effective absorption bandwidth,EAB)为4.14 GHz;氮气DBD处理之后,在厚度为2.8 mm时,N-NCNHs的RL_(min)为-47.88 dB,在厚度为1.8 mm时的EAB为3.72 GHz。吸波性能的提升归因于DBD处理实现的阻抗匹配和衰减能力的平衡。具体来说,通过DBD处理调控NCNHs的含氧基团含量以提高阻抗匹配,为高性能吸波剂的阻抗匹配优化提供了一种新的思路。Singlewalled carbon nanohorns(CNHs)are promising lightweight materials for electromagnetic wave absorption.Their“dahlialike”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 singlewalled carbon nanohorns(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(RL_(min))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 thickness 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 improved.This study provided a new approach for optimizing impedance matching in highperformance absorbers.

关 键 词：氮掺杂单壁碳纳米角 介质阻挡放电等离子体 电磁波吸收 阻抗匹配 

分 类 号：TQ127.1[化学工程—无机化工]