Preparation and Microwave Absorption Performance of Polyaniline/CoFe2O4 Nano-composite by Coordination-oxidative Polymerization-hydrothermal Method†

doi:10.7503/cjcu20130804

Abstract

Abstract:

Polyaniline/CoFe₂O₄ binary nano-composites were prepared by coordination-oxidative polymerization-hydrothermal method, and doped by sulfosalicylic acid. The influence of reactants ratio and concentration of doping acid on electromagnetic properties of resulting composites was investigated. The micrographs, structure and electromagnetic properties of polyaniline/CoFe₂O₄ composites were characterized by TEM, XRD, FTIR and electromagnetic measurements. The results indicate that the prepared composite show a multi-level structure in which CoFe₂O₄ is cube-shaped with an average particle size less than 20 nm. The optimal experimental results were as follows: the conductivity of the composite is about 0.43 S/cm when the content of CoFe₂O₄ in composite is 8.86%(mass fraction). When the thickness of PAn/CoFe₂O₄ composite is at 2 mm, a maximum reflection loss of -16.71 dB at 16.01 GHz is observed with a bandwidth of 4.68 GHz above -10 dB loss; and when the thickness of PAn/CoFe₂O₄ composite is at 3.2 mm, a maximum reflection loss of -51.81 dB at 9.23 GHz is observed with a bandwidth of 3.69 GHz above -10 dB loss. The nanocomposite exhibits excellent microwave absorbing capacity.

Key words: Coordination-oxidative polymerization-hydrothermal method, Polyaniline/CoFe2O4 nanocompo-site, Microwave absorption, Reflection loss

CLC Number:

TrendMD:

JIANG Junjun, YANG Chunming, WANG Hongbo, LIU Xiaohua, LI Longhao. Preparation and Microwave Absorption Performance of Polyaniline/CoFe₂O₄ Nano-composite by Coordination-oxidative Polymerization-hydrothermal Method^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 402.

Figures/Tables 10

Scheme 1 Preparation of PAn/CoFe2O4 nano-composite by coordination-oxidative polymerization-hydrothermal method

Table 1 Electrical conductivity of PAn/CoFe2O4 prepared under different amounts of aniline

Amount of aniline/mL	m(CoFe₂O₄)(%)	10² σ/(S·cm^-1)	Amount of aniline/mL	m(CoFe₂O₄)(%)	10² σ/(S·cm^-1)
0.5	20.92	2.07	2.0	8.86	6.21
1.0	14.00	8.20	2.5	8.28	2.93
1.5	12.34	1.32

Fig.1 Electrical conductivity(σ) of PAn/CoFe2O4 doped by different concentrations of SSA

Fig.2 SEM images of samples before(A) and after(B) hydrothermal reaction and TEM image of sample after removal of PAn(C)

Fig.3 XRD patterns of PAn(a) and PAn/CoFe2O4(b)

Fig.4 FTIR spectra of CoFe2O4(a), PAn/CoFe2O4(b) and doped PAn/CoFe2O4(c)

Fig.5 Dielectric loss tangent(tanδE)(A) and magnetic loss tangent(tanδM)(B) for PAn/CoFe2O4 vs. frequencyσ/(S·cm-1): a. 10-4; b. 10-3; c. 10-2; d. 10-1.

Table 2 Reflection loss values of PAn/CoFe2O4 prepared under different amount of aniline

Amount of aniline/mL	10² σ/(S·cm^-1)	R_min/dB	Amount of aniline/mL	10² σ/(S·cm^-1)	R_min/dB
0.5	2.07	-5.43	2.0	6.21	-11.15
1.0	8.20	-6.56	2.5	2.93	-8.91
1.5	1.32	-6.96

Fig.6 Frequency dependence of the reflection loss of PAn/CoFe2O4 with layers of different sample thickness

Fig.7 Reflection loss curves of PAn/CoFe2O4 prepared under different conductivity magnitudeσ/(S·cm-1): a. 10-4; b. 10-3; c. 10-2; d. 10-1.

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Preparation and Microwave Absorption Performance of Polyaniline/CoFe₂O₄ Nano-composite by Coordination-oxidative Polymerization-hydrothermal Method^†

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