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Citation: XIE Ming-Da, TIAN Xiao-Xia, QU Shao-Bo, CHENG Hua-Lei. Synthesis and Electromagnetic Properties of Porous Carbonyl Iron/SiO2/Polypyrrole Core-Shell Structure Composites[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(7): 1261-1270. doi: 10.11862/CJIC.2018.178 shu

Synthesis and Electromagnetic Properties of Porous Carbonyl Iron/SiO2/Polypyrrole Core-Shell Structure Composites

  • 1.

    Air Force Engineering University, Xi'an 710051, China

  • 2.

    The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

  • 3.

    Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji, Shaanxi 721013, China

Figures(10)

  • Porous carbonyl iron powder(CIP) was obtained by means of point erosion and then porous carbonyl iron/SiO2/polypyrrole(porous-CIP/SiO2/PPy) composites were prepared by the Stöber process together with the in-situ polymerization. The phase structure and micro morphology of the composites were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscope(TEM), and Fourier transform infrared spectra(FT-IR). The electromagnetic parameters and microwave absorption properties were measured in 2.0~18.0 GHz by the coaxial method using network analyzer. The effect of the mass ratio of CIP/PPy on electromagnetic properties of the composites was investigated. The measured SEM and TEM show that the porous-CIP particles are firstly coated with SiO2 shell and then graft PPy to form core-shell structures. The absorption loss peak moves to lower frequency with increasing added amount of pyrrole. A minimum reflection loss (RL) of -23 dB and an effective bandwidth(RL below -10 dB) of 8.12 GHz in 9.44~17.56 GHz are obtained for coating thickness of 3.5 mm and 6%(w/w) pyrrole, which can be attributed to the effective impedance match and multiple interfacial polarizations. Owing to the low density and high absorption, the porous-CIP/SiO2/PPy composite can be a promising candidate as lightweight, efficient microwave absorbents.
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