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

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| 24 feb 2017

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Materials Science-Poland

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

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Pubblicato online: 24 feb 2017

Pagine: 94 - 104

Ricevuto: 23 gen 2016

Accettato: 30 nov 2016

DOI: https://doi.org/10.1515/msp-2017-0010

Parole chiave
cobalt ferrite, polyaniline, double-layer absorber, reflection loss

© 2017 Yewen Xu, Guozhu Shen, Hongyan Wu, Bin Liu, Xumin Fang, Ding Zhang, Jun Zhu

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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

eISSN:: 2083-134X
Lingua:: Inglese

Frequenza di pubblicazione:: 4 volte all'anno
Argomenti della rivista:: Materials Sciences, other, Nanomaterials, Functional and Smart Materials, Materials Characterization and Properties

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