Synthesis and Microwave Absorption Performance of Fe3O4@PPy@PANI Composites†

doi:10.7503/cjcu20170318

Abstract

Abstract:

Polypyrrole(PPy) was used to modify the surface of Fe₃O₄ nanoparticles which was prepared by solvothermal method. Polyaniline(PANI) was used to control the electromagnetic component of Fe₃O₄@PPy composites, and then Fe₃O₄@PPy@PANI composites with core-shell structure were successfully prepared. Modifying Fe₃O₄ nanoparticles with PPy made PANI easily coated on the surface of magnetic nano-particles, and the reasons for this phenomenon were discussed in this paper. The results of the electromagnetic performance analysis show that the minimum reflection loss(RLmin) reaches -39.2 dB when the mass ratio of aniline(An) to Fe₃O₄ @PPy is 1∶4. The bandwidth of reflection loss less than -10 dB is 4.6 GHz when the mass ratio of An to Fe₃O₄ @PPy is 1∶2. The proportion of electromagnetic components have a greater impact on the microwave absorbing properties, which are also described in this article.

Key words: Solvothermal method, Core-shell structure, Microwave absorbing material, Conductive polymer, Fe3O4 nanoparticles, Polypyrrole, Polyaniline

CLC Number:

O633.5
TM25

TrendMD:

ZHANG Long, WAN Xiaona, DUAN Wenjing, QIU Hu, HOU Jieqiong, WANG Xiaorui, LI Hui, DU Xueyan. Synthesis and Microwave Absorption Performance of Fe₃O₄@PPy@PANI Composites^†[J]. Chem. J. Chinese Universities, 2018, 39(1): 185.

Figures/Tables 10

Fig.1 TEM images of Fe3O4(A), Fe3O4/PANI(B), Fe3O4@PPy(C) and Fe3O4@PPy@PANI(D—G) (D) S3; (E) S4; (F) S5; (G) S6.

Fig.2 XRD of corresponding to S1—S6(a—f)

Fig.3 FTIR of corresponding to Fe3O4(a), PANI(b), PPy(c), Fe3O4@PPy(d) and Fe3O4@PPy@PANI(S4)(e)

Fig.4 Hysteresis loops of S1—S6(A), enlarged view of magnetization of S1—S6(B) and the relationship between saturation magnetization of S1—S6(C)

Fig.5 Frequency dependence on the real parts(A), imaginary parts(B) of the complex permittivity, dielectric loss tangents(C), real parts(D), imaginary parts(E) of permeability and magnetic loss tangents(F) of S2—S6(a—e)

Fig.6 Microwave re?ection losses(d=2 mm) of samples S2—S6 in the frequency range

Fig.7 Microwave re?ection losses of composites of S2—S6(A —E)d/mm: a. 1; b. 1.5; c. 2; d. 2.5; e. 3; f. 3.5; g. 4; h. 4.5; i. 5.

Fig.8 C0-f curves of S2—S6

Fig.9 Typical Cole-Cole semicircles for S4(A) and S5(B) in the frequency range of 2.0—18.0 GHz

Fig.10 Reflection loss at various thickness and λ/4 thickness of S4(A) and S5(B) on frequencyd/mm: a. 1; b. 1.5; c.2; d.2.5; e.3; f.3.5; g.4; h. 4.5; i. 5.

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Synthesis and Microwave Absorption Performance of Fe₃O₄@PPy@PANI Composites^†

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