Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites
Organic-inorganic nano-CoFe2O4/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...
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doaj-735fa47a54f842f0b17abe77157070922021-09-06T19:20:26ZengSciendoMaterials Science-Poland2083-134X2017-02-013519410410.1515/msp-2017-0010msp-2017-0010Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell compositesXu Yewen0Shen Guozhu1Wu Hongyan2Liu Bin3Fang Xumin4Zhang Ding5Zhu Jun6Science and Technology on Near-Surface Detection Laboratory, Wuxi214035, ChinaScience and Technology on Near-Surface Detection Laboratory, Wuxi214035, ChinaSchool of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing210044, ChinaSchool of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing210044, ChinaScience and Technology on Near-Surface Detection Laboratory, Wuxi214035, ChinaScience and Technology on Near-Surface Detection Laboratory, Wuxi214035, ChinaScience and Technology on Near-Surface Detection Laboratory, Wuxi214035, ChinaOrganic-inorganic nano-CoFe2O4/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 CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4 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 CoFe2O4/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.https://doi.org/10.1515/msp-2017-0010cobalt ferritepolyanilinedouble-layer absorberreflection loss |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xu Yewen Shen Guozhu Wu Hongyan Liu Bin Fang Xumin Zhang Ding Zhu Jun |
spellingShingle |
Xu Yewen Shen Guozhu Wu Hongyan Liu Bin Fang Xumin Zhang Ding Zhu Jun Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites Materials Science-Poland cobalt ferrite polyaniline double-layer absorber reflection loss |
author_facet |
Xu Yewen Shen Guozhu Wu Hongyan Liu Bin Fang Xumin Zhang Ding Zhu Jun |
author_sort |
Xu Yewen |
title |
Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites |
title_short |
Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites |
title_full |
Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites |
title_fullStr |
Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites |
title_full_unstemmed |
Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites |
title_sort |
double-layer microwave absorber based on nanocrystalline cofe2o4 and cofe2o4/pani multi-core/shell composites |
publisher |
Sciendo |
series |
Materials Science-Poland |
issn |
2083-134X |
publishDate |
2017-02-01 |
description |
Organic-inorganic nano-CoFe2O4/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 CoFe2O4/PANI composite (matching layer) and calcined CoFe2O4 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 CoFe2O4/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. |
topic |
cobalt ferrite polyaniline double-layer absorber reflection loss |
url |
https://doi.org/10.1515/msp-2017-0010 |
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