Preparation and Electromagnetic Wave-absorbing Properties of Micro-polyaniline/Fe3O4 Hollow Spheres†

doi:10.7503/cjcu20141000

Abstract

Abstract:

Doped polyaniline/Fe₃O₄(D-PANI/Fe₃O₄) with hollow spheres were prepared by the combination of interfacial polymerization and Pickering emulsion polymerization method with toluene as soft template, Fe₃O₄ nanoparticles as cosurfactant, sodium dodecyl benzene sulfonate(SDBS) as emulsifier, ammonium persulfate(APS) as oxidant, hydrochloric acid(HCl) as the doping agent. And as a comparison, the polyaniline/Fe₃O₄(PANI/Fe₃O₄) with hollow spheres were prepared without acid doping. The morphology, structure, integrant, magnetic and electrical properties of the composite material were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), thermogravimetric(TG), vibration sample magnetism(VSM) and the four-probe method, respectively. The results indicate that the D-PANI/Fe₃O₄ with hollow spheres structures were prepared successfully. The diameter of D-PANI/Fe₃O₄ hollow spheres was about 2.8 μm, the conducti-vity and saturation magnetization(M_s) of D-PANI/Fe₃O₄ hollow spheres were 2.75×10^-2 S/cm and 54.26A·m²/kg, respectively.The quality of Fe₃O₄ nanoparticles accounted for about 28% of D-PANI/Fe₃O₄ hollow spheres. Electromagnetic properties and wave absorption performance of D-PANI/Fe₃O₄ hollow spheres and PANI/Fe₃O₄ hollow spheres were analyzed by vector network analyzer(VNA). The results showed that the best absorbing property and minimum reflection loss(RL) of D-PANI/Fe₃O₄ composites were -43.3 dB at 12.64 GHz with the matching thickness of 2 mm, and the wave absorption performance was superior to PANI/Fe₃O₄ composites.

Key words: Interfacial polymerization, Polyaniline, Magnetic nanoparticle, Composite material, Microwave absorption

CLC Number:

O633.5
TM25

TrendMD:

LI Tao, ZHANG Long, CHEN Ying, GUO Yajun, DU Xueyan. Preparation and Electromagnetic Wave-absorbing Properties of Micro-polyaniline/Fe₃O₄ Hollow Spheres^†[J]. Chem. J. Chinese Universities, 2015, 36(4): 772.

Figures/Tables 8

Scheme 1 Schematic representation of the possible process of D-PANI/Fe3O4 hollow spheres

Fig.1 TEM images of Fe3O4-CA(A), PANI/Fe3O4(B), D-PANI/Fe3O4(C) and SEM image of D-PANI/Fe3O4(D)

Fig.2 XRD patterns(A) and FTIR spectra(B) of Fe3O4-CA(a), PANI/Fe3O4(b) and D-PANI/Fe3O4(c)

Fig.3 Magnetization curves of Fe3O4-CA(a), PANI/Fe3O4(b) and D-PANI/Fe3O4(c)

Fig.4 Potograph of D-PANI/Fe3O4 dispersed in the water in the presence(A) and absence(B) of an external magnetic field

Fig.5 TG curves of PANI/Fe3O4(a) and D-PANI/Fe3O4(b)

Fig.6 Complex permittivity(A,B) and complex permeability(C,D) of samples 1—3(A—C) and sample 4 mixed with paraffin(D) a. 30%D-PANI/Fe3O4; b. 50%D-PANI/Fe3O4; c. 70%D-PANI/Fe3O4; d. 70%PANI/Fe3O4.

Fig.7 Reflection loss curves of mixed samples 1—4 with different thickness Mass fraction of D-PANI/Fe3O4 composites in mixed samples 1—3: (A) 30%; (B) 50%; (C) 70%.Mass fraction of PANI/Fe3O4 composites in mixed sample 4 is 70%.

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Preparation and Electromagnetic Wave-absorbing Properties of Micro-polyaniline/Fe₃O₄ Hollow Spheres^†

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