纺锤状ZnO/还原氧化石墨烯异质结构及其微波吸收性能  

Microwave Absorption Performance of Spindle-Shaped ZnO/Reduced Graphene Oxide Heterostructure

作　　者：贺军哲 孙新[1] 疏金成 杨轩[1] 曹茂盛[2] HE Jun-zhe;SUN Xin;SHU Jin-cheng;YANG Xuan;CAO Mao-sheng(Beijing Institute of Environmental Characteristics,Beijing 100854,China;Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京环境特性研究所,北京100854 [2]北京理工大学,北京100081

出　　处：《表面技术》2020年第2期88-94,共7页Surface Technology

基　　金：国家自然科学基金（11774027,11574261,11604237,51132002,51072024,51372282)~~

摘　　要：目的调节石墨烯的电磁匹配,以实现最优的微波吸收性能。方法通过改进的Hummers法制备氧化石墨烯GO,以六水合硝酸锌、双六甲撑三胺、氧化石墨烯为原料,采用水热法在140℃获得了具有异质结构的包裹r-GO的纺锤状ZnO棒(S-ZnO/r-GO)。通过X射线衍射分析仪(XRD)、扫描电子显微镜(SEM)以及透射电子显微镜(TEM)测试,分别对S-ZnO/r-GO的组成成分、形貌特征以及微观结构进行了表征,同时采用同轴法,通过矢量网络分析仪测试分析了不同填充浓度下S-ZnO/r-GO复合材料在2~18 GHz范围内的电磁特性,并通过计算得到了材料的微波反射率损耗。结果尺寸均匀且相互交织的纺锤状ZnO棒被大量褶皱的还原氧化石墨烯所包覆,构建了一种相互连接的三维交织结构。纺锤状ZnO的引入以及三维结构的建立,明显改善了S-ZnO/r-GO异质结构在2~18 GHz频率范围内的电磁特性和微波响应。在厚度为2.0 mm,频率为14.8 GHz处,最大反射率损耗值达到−40 dB,有效吸收带宽几乎覆盖整个Ku波段。结论纺锤状ZnO/r-GO复合材料表现出优异的微波吸收性能和较宽的有效吸收频段,具有一定的应用前景。This work aims to adjust the electromagnetic matching of graphene to achieve the best microwave absorption performance.Graphene oxide was prepared by improved Hummers method.The spindle-shaped ZnO rods wrapped by reduced graphene oxide(S-ZnO/r-GO)with heterostructure were synthesized by the hydrothermal method at 140℃with Zinc nitrate hexahydrate,bis-hexamethylene triamine and graphene oxide as raw materials.The composition,morphology and microstructure of S-ZnO/r-GO were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM)and transmission electron microscopy(TEM).The electromagnetic properties of S-ZnO/r-GO composite with different mass ratios were tested by vector network analyzer in the frequency range of 2~18 GHz through coaxial method,and the microwave reflection loss of the composite was calculated.The interlaced spindle-shaped ZnO rods with uniform shapes were wrapped with plenty crumpled r-GO sheets,thus constructing an interconnected 3D structure.Both the introduction of spindle-shaped ZnO and the construction of 3D structure significantly improved the electromagnetic characteristics and microwave response of S-ZnO/r-GO heterostructure in the frequency range of 2~18 GHz.A maximum reflection loss value of−40 dB was achieved at a thickness of 2.0 mm and a frequency of 14.8 GHz.The effective absorption bandwidth almost covered the whole Ku band.The composites of S-ZnO/r-GO exhibit prominent microwave absorption performance and wide effective absorption bandwidth and have certain application prospects.

关 键 词：纺锤状ZnO棒 还原氧化石墨烯 异质结构 电磁特性 微波吸收 

分 类 号：TM25[一般工业技术—材料科学与工程]