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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Main Authors: Xu Yewen, Shen Guozhu, Wu Hongyan, Liu Bin, Fang Xumin, Zhang Ding, Zhu Jun
Format: Article
Language:English
Published: Sciendo 2017-02-01
Series:Materials Science-Poland
Subjects:
Online Access:https://doi.org/10.1515/msp-2017-0010
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spelling 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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