化学气相沉积法制备同轴核壳结构CNTs@SiC的电磁特性研究  

Electromagnetic Properties of Coaxial Core-Shell CNTs@SiC Prepared by Chemical Vapor Deposition

作　　者：王伟超 刘顾 汪刘应 葛超群 王文豪 胡灵杰 杨鑫 王子昂 Wang Weichao;Liu Gu;Wang Liuying;Ge Chaoqun;Wang Wenhao;Hu Lingjie;Yang Xing;Wang Ziang(Rocket Force University of Engineering,Xi’an 710025,China)

机构地区：[1]火箭军工程大学,陕西西安710025

出　　处：《稀有金属材料与工程》2022年第10期3743-3751,共9页Rare Metal Materials and Engineering

基　　金：国防科技基础加强计划技术领域基金(2020-JCJQ-JJ222);陕西省“特支计划”(陕组通字(2020)44号);陕西省创新团队(2014KCT-03)。

摘　　要：以Si单质和功能化多壁碳纳米管(CNTs)为原料,采用化学气相沉积法(CVD)制备了CNTs@SiC同轴核壳结构复合吸波剂。CNTs@SiC的一维管状核壳结构有利于提高材料的介电性能和调节阻抗匹配性能,并能有效提高CNTs的初始氧化温度。Si与CNTs质量比是影响此复合材料电磁特性的关键参数,当m(Si):m(CNTs)=1:1.5时,复合材料有最好的吸波性能,当其厚度为1.7 mm时,反射率小于-10 dB所对应的有效带宽达到4.8 GHz;当m(Si):m(CNTs)=1:2时,材料在X波段有最好的吸波效果,有效带宽达3 GHz。所制备的CNTs@SiC复合材料不仅在室温下具有宽频强吸收的特点,其独特的一维管状核壳结构有望使材料在高温环境下仍具有优异的吸波性能。CNTs@SiC coaxial core-shell composite absorber was prepared by chemical vapor deposition(CVD)with monatomic silicon and functionalized multi-walled carbon nanotubes(CNTs).The one-dimensional tubular core-shell structure of CNTs@SiC is conducive to the improvement of dielectric properties and the adjustment of impedance matching performance,and effectively improves the initial oxidation temperature of CNTs.The mass ratio of Si to CNTs is a key parameter affecting electromagnetic properties of the composite.When m(Si):m(CNTs)=1:1.5,the composite has the best absorbing performance.The effective bandwidth corresponding to reflectivity less than-10 dB reaches 4.8 GHz when the thickness is 1.7 mm.When m(Si):m(CNTs)=1:2,the material has the best absorbing effect in X band,with effective bandwidth up to 3 GHz.The CNTs@SiC composite absorber not only has excellent absorbing effect at normal temperature,but also is expected at high temperature due to its unique one-dimensional core-shell structure.

关 键 词：碳纳米管(CNTs) 化学气相沉积(CVD) 核壳结构 介电性能 抗氧化性 电磁波吸收 

分 类 号：TB34[一般工业技术—材料科学与工程]