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Preparation and microwave absorption properties of silver-coated Nd-deposed strontium ferrite hollow microspheres with polypyrrole composites

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Abstract

The ternary composite (PPy/Ag/SFHM) was prepared by in situ polymerication of pyrrole with SFHM. The result composites were characterized by SEM, XRD, FTIR, VSM and TG, respectively. It shows that the conductivity, Ms and Hc of the ternary composite is 2.87 S/cm, 17.946 emu/g and 1.64 kOe and Ag/BFHM microspheres and PPy forms composites as shown in SEM images. PPy/Ag/SFHM (RL = −14.12 dB at 10.76 GHz) performs better electromagnetic absorption properties than PPy (RL = −4.58 dB at 9.94 GHz) and Ag/SFHM (RL = −10.25 dB at 10.36 GHz). Minimal reflection loss of the microwave absorption or matching condition occurs when the thickness of the absorbers approximates an odd number multiple of a quarter of the propagating wavelength. The matching frequency for minimum reflection loss decreases and the RL curves shift to the lower frequency with increasing thickness of the composite. The resulting composite can be utilized for reduction of radar signatures.

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’an, 710072, China

    Lindong Li, Miao Li & Shuhua Qi

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  1. Lindong Li
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  2. Miao Li
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  3. Shuhua Qi
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Correspondence to Shuhua Qi.

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Li, L., Li, M. & Qi, S. Preparation and microwave absorption properties of silver-coated Nd-deposed strontium ferrite hollow microspheres with polypyrrole composites. J Mater Sci: Mater Electron 28, 4288–4294 (2017). https://doi.org/10.1007/s10854-016-6052-6

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  • DOI: https://doi.org/10.1007/s10854-016-6052-6

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