反射损耗
石墨烯
微波食品加热
材料科学
电介质
纳米片
电磁辐射
氧化物
介电损耗
阻抗匹配
复合数
光电子学
吸收(声学)
纳米技术
电阻抗
复合材料
光学
物理
冶金
工程类
电气工程
量子力学
作者
Yi Ding,Zheng Zhang,Baohe Luo,Qingliang Liao,Shuo Liu,Yichong Liu,Yue Zhang
出处
期刊:Nano Research
[Springer Nature]
日期:2016-12-07
卷期号:10 (3): 980-990
被引量:158
标识
DOI:10.1007/s12274-016-1357-6
摘要
A cobaltosic-oxide-nanosheets/reduced-graphene-oxide composite (CoNSs@RGO) was successfully prepared as a light-weight broadband electromagnetic wave absorber. The effects of the sample thickness and amount of composite added to paraffin samples on the absorption properties were thoroughly investigated. Due to the nanosheet-like structure of Co3O4, the surface-to-volume ratio of the wave absorption material was very high, resulting in a large enhancement in the absorption properties. The maximum refection loss of the CoNSs@RGO composite was–45.15 dB for a thickness of 3.6 mm, and the best absorption bandwidth with a reflection loss below–10 dB was 7.14 GHz with a thickness of 2.9 mm. In addition, the peaks of microwave absorption shifted towards the low frequency region with increasing thickness of the absorbing coatings. The mechanism of electromagnetic wave absorption was attributed to impedance matching of CoNSs@RGO as well as the dielectric relaxation and polarization of RGO. Compared to previously reported absorbing materials, CoNSs@RGO showed better performance as a lightweight and highly efficient absorbing material for application in the high frequency band.
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