Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites Cover

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Double-layer microwave absorber based on nanocrystalline CoFe2O4 and CoFe2O4/PANI multi-core/shell composites

Materials Science-Poland

Volume 35 (2017): Issue 1 (March 2017)

By: Yewen Xu, Guozhu Shen, Hongyan Wu, Bin Liu, Xumin Fang, Ding Zhang and Jun Zhu

Open Access

|Feb 2017

Figures & Tables

XRD patterns of samples S1, S2, S3 and S4.

TEM (a, b, d, f) and SEM (c, e) images of the sample S1 (a), S2 (b), S3 (c, d) and S4 (e, f).

Schematic illustration of the synthesis process of CoFe2O4/PANI multi-core/shell composites.

Hysteresis loops at room temperature for sample S2, S3 and S4.

Variation of complex permittivity and permeability of sample S2, S3 and S4 with frequency.

Sketch map of incidence of electromagnetic wave in multi-layer absorber.

Absorption curves of the layers with thickness d = 2.0 mm (a), 2.5 mm (b), and variation of dielectric loss tangent (c) and magnetic loss tangent (d) of sample S2, S3 and S4 with frequency.

Absorption curves of the double-layer absorbers with a total layer thickness d = 2.0 mm (a), 2.5 mm (b).

Microwave absorption properties of single layer (S2-S4) and double-layer (S5-S11) absorbers with total thickness of 2_0 mm and 2_5 mm_

Sample	Material	Thickness [mm]	Total thickness [mm]	Min. R [dB]	R peak [GHz]	Bandwidth R < –10 dB [GHz]
S2	Calcined ferrite	2.0	2.0	–3.2	11.7	–

		2.5	2.5	–4.8	11.8	–

S3	Ferrite/PANI composite	2.0	2.0	–17.4	17.0	14.9 – 18.0 (3.1)

		2.5	2.5	–16.6	12.1	11.1 – 14.5 (3.4)

S4	Ferrite/PANI composite	2.0	2.0	–19.0	16.2	14.1 – 18.0 (3.9)

		2.5	2.5	–23.6	13.1	10.8 – 14.5 (3.7)

S5	Layer 1: S2	0.5	2.0	–28.8	16.2	13.8 – 18.0 (4.2)
			2.0	–28.8	16.2	13.8 – 18.0 (4.2)
	Layer 2: S4	1.5

S6	Layer 1: S2	1.0	2.0	–22.3	16.2	14.2 – 18.0 (3.8)
			2.0	–22.3	16.2	14.2 – 18.0 (3.8)
	Layer 2: S4	1.0

S7	Layer 1: S2	1.5	2.0	–11.6	17.3	15.9 – 18.0 (2.1)
			2.0	–11.6	17.3	15.9 – 18.0 (2.1)
	Layer 2: S4	0.5

S8	Layer 1: S2	0.5	2.5	–28.8	12.8	10.3 – 15.8 (5.5)
			2.5	–28.8	12.8	10.3 – 15.8 (5.5)
	Layer 2: S4	2.0

S9	Layer 1: S2	1.0	2.5	–31.1	12.8	10.3 – 15.8 (5.5)
			2.5	–31.1	12.8	10.3 – 15.8 (5.5)
	Layer 2: S4	1.5

S10	Layer 1: S2	1.5	2.5	–22.4	13.2	11.1 – 15.8 (4.7)
			2.5	–22.4	13.2	11.1 – 15.8 (4.7)
	Layer 2: S4	1.0

S11	Layer 1: S2	2.0	2.5	–11.2	11.7	11.5 – 12.0 (0.5)
			2.5	–11.2	11.7	11.5 – 12.0 (0.5)
	Layer 2: S4	0.5

DOI: https://doi.org/10.1515/msp-2017-0010 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331

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Language: English

Page range: 94 - 104

Submitted on: Jan 23, 2016

Accepted on: Nov 30, 2016

Published on: Feb 24, 2017

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

cobalt ferrite,

double-layer absorber,

reflection loss

Related subjects:

Materials sciences,

Materials sciences, other,

Functional and smart materials,

Materials characterization and properties

© 2017 Yewen Xu, Guozhu Shen, Hongyan Wu, Bin Liu, Xumin Fang, Ding Zhang, Jun Zhu, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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