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Stacked polypyrrole-coated non-woven fabric sheets for absorbing electromagnetic waves with extremely high frequencies

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Abstract

Conductive non-woven fabric sheets coated with polypyrrole nanoparticles and having resistivity from 1.5 × 105 to 3.0 Ω cm were prepared by immersing non-woven fabric sheets in solutions containing various concentrations of oxidizing agent and dopant and then exposing the sheets to pyrrole vapor. A stack of ten treated sheets could absorb more than 95% of electromagnetic waves in the frequency range of 75–110 GHz and more than 99% in the range of 85–105 GHz, irrespective of the resistivity of the sheet. This absorption was achieved even though the thickness of the stack was less than 10 mm. Furthermore, a conductive non-woven fabric sheet with resistivity of 7.5 Ω cm and thickness of only 0.5 mm could absorb about 90% of electromagnetic waves in the range of 75–110 GHz. These results clearly demonstrate that the stacked conductive non-woven fabric sheets prepared in this study are a new material that effectively absorbs electromagnetic waves with extremely high frequencies in the millimeter band.

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Authors and Affiliations

  1. Osaka Research Laboratory, Tayca Corporation, 3-47, 1-Chome, Funamachi, Taisho-ku, 551-0022, Osaka, Japan

    Yoshihiro Egami, Kunio Suzuki & Tadashi Yasuhara

  2. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, 599-8531, Osaka, Japan

    Yoshihiro Egami, Eiji Higuchi & Hiroshi Inoue

  3. Department of Communications Engineering, National Defense Academy, 10-20, 1-Chome, Hashirimizu, Yokosuka, Kanagawa, 239-8686, Japan

    Takashi Yamamoto

Authors
  1. Yoshihiro Egami
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  2. Takashi Yamamoto
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  3. Kunio Suzuki
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  4. Tadashi Yasuhara
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  5. Eiji Higuchi
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  6. Hiroshi Inoue
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Correspondence to Yoshihiro Egami.

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Egami, Y., Yamamoto, T., Suzuki, K. et al. Stacked polypyrrole-coated non-woven fabric sheets for absorbing electromagnetic waves with extremely high frequencies. J Mater Sci 47, 382–390 (2012). https://doi.org/10.1007/s10853-011-5809-9

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  • DOI: https://doi.org/10.1007/s10853-011-5809-9

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