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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/045/0044

    • Keywords

       

      Carbon fibre; EMI; epoxy; MWCNT; nanocomposites; shielding efficiency.

    • Abstract

       

      The impact of reinforcing multi-walled carbon nanotubes (MWCNT) and uni-directional carbon fibre fabric (UCFF) in the epoxy polymer matrix on the electromagnetic interference shielding efficiency (EMI SE) is studied in the X-band frequency range (8–12 GHz). The increase in the weight percentage (wt%) of pristine MWCNT increases the EMI SE of the nanocomposites. Inclusion of UCFF, as a layer, enhances the EMI SE of the structure to a great extent giving an EMI SE of around 75 dB at 12 GHz for UCFF-sandwiched 5 wt% MWCNT–epoxy composite. The layered structure, epoxy–MWCNT/UCFF/epoxy–MWCNT introduces heterogeneity and this results in a SE much higher than the individual contributions of MWCNT and UCFF. The analysis suggests that the presence of thin layer of UCFF absorbs the radiation apart from inducing multiple scattering enhancing the absorption within the MWCNT– epoxy region.

    • Author Affiliations

       

      ABHISHEK SHARMA1 MYNENI SUKESH BABU1 ASAPU VINAYA KUMAR2 R SARATHI1 V SUBRAMANIAN2

      1. Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
      2. Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India

    • Dates

       
      Published
      28 February 2022
      Manuscript received
      22 July 2021
      Accepted
      10 November 2021
      Final version published online
      28 February 2022

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