反射损耗
材料科学
聚苯胺
铁氧体(磁铁)
复合材料
微波食品加热
复合数
纳米晶材料
聚合
聚合物
纳米技术
量子力学
物理
作者
Yewen Xu,Guozhu Shen,Hongyan Wu,Bin Liu,Xumin Fang,Ding Zhang,Jun Zhu
出处
期刊:Materials Science Poland
[De Gruyter]
日期:2017-02-24
卷期号:35 (1): 94-104
被引量:19
标识
DOI:10.1515/msp-2017-0010
摘要
Abstract Organic-inorganic nano-CoFe 2 O 4 /PANI (polyaniline) multi-core/shell composites have been successfully synthesized by chemical oxidative polymerization of aniline. The characterization results showed that the ferrite nanocrystals were efficiently embedded in PANI. The electromagnetic parameters of the composites were measured by a vector network analyser in the frequency range of 2 GHz to 18 GHz. Double-layer absorbers based on the CoFe 2 O 4 /PANI composite (matching layer) and calcined CoFe 2 O 4 ferrite (absorbing layer) have been designed. The reflection loss of the microwave absorbers of both single layer and double-layer with a total thickness of 2.0 mm and 2.5 mm was calculated according to transmission-line theory. The results indicated that the minimum reflection loss of the CoFe 2 O 4 /PANI composite was −19.0 dB at 16.2 GHz at the thickness of 2.0 mm and −23.6 dB at 13.1 GHz at the thickness of 2.5 mm, respectively. The minimum reflection loss for double-layer absorbers reached −28.8 dB at 16.2 GHz at the total thickness of 2.0 mm, and −31.1 dB at 12.8 GHz at the total thickness of 2.5 mm. The absorption bandwidth under −10 dB was 4.2 GHz (13.8 GHz to 18.0 GHz) and 5.5 GHz (10.3 GHz to 15.8 GHz), respectively. The results show that the reflection loss and absorption bandwidth of the double-layer absorbers are obviously enhanced compared to corresponding single layer absorbers.
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