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Microwave absorbing property and preparation of CoNi@SiO2@PPy composite in X-band

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Abstract

CoNi alloy@SiO2@Polypyrrole microwave absorbing nanocomposites with three-layer core–shell structure was synthesized successfully through three-step reaction: Co20Ni80 core preparation via a solvothermal reaction, SiO2 coating by a modified stöber method and Polypyrrole (PPy) coating through an in-situ polymerization. The surface morphologies and chemical components were characterized by field emission scanning electron microscope, X-ray diffraction and X-ray photoelectron spectroscope. The results indicate that the SiO2 and PPy shells coat CoNi core successfully and completely. the saturation magnetization (Ms) of CoNi@SiO2@PPy nanocomposites are 42.1 emu/g. the effective complementarity between magnetic loss contributed by CoNi cores and dielectric loss from SiO2 and PPy shells makes CoNi@SiO2@PPy significant enhanced microwave absorbing capacity. The minimum reflection loss could up to − 34.19 dB at frequency of 9.59 GHz with a very thin thickness 2.12 mm, furthermore, in this thickness, the effective absorbing bandwidth with reflection loss less than − 10 dB is the entire X-band, showing that the CoNi@SiO2@PPy nanocomposites a very outstanding and promising microwave absorber.

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Authors and Affiliations

  1. 365 Institute, Northwestern Polytechnical University, Xi’an, Shaanxi, China

    Jian Zhang

  2. Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China

    Xingwei Wang

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  1. Jian Zhang
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Correspondence to Jian Zhang.

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Zhang, J., Wang, X. Microwave absorbing property and preparation of CoNi@SiO2@PPy composite in X-band. J Mater Sci: Mater Electron 29, 1592–1599 (2018). https://doi.org/10.1007/s10854-017-8069-x

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  • DOI: https://doi.org/10.1007/s10854-017-8069-x

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