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      https://www.ias.ac.in/article/fulltext/boms/043/0187

    • Keywords

       

      Transparent conducting electrodes; flexible; metal mesh; EMI shielding; Joule heater.

    • Abstract

       

      Electromagnetic interference (EMI) shields in the form of coatings and films are useful for blocking radiations in various household and industrial settings. Being transparent and flexible would enhance their utility domain. In this study, we have fabricated transparent and flexible EMI shields made of metal meshes produced using the crack templating method pioneered in the laboratory. A Cu metal mesh with polyethylene terephthalate (PET) sheet as its substrate exhibited a visible transmittance of $\sim$85% and a sheet resistance of $\sim$0.83 $\Omega$ per square. The shielding efficiency was tested over a wide spectral range of the K$_{\rm u}$ band (12–18 GHz), relevant to communication electronics. The Cu mesh/PET film showed a remarkably high value for total EMI shielding (SE$_{\rm T}$) with the average value being $\sim$41 dB. The film could be laminated using a commonly available method, thus protecting exposure of the mesh to the environment. The laminated film is multifunctional, and this aspect was demonstrated by fabricating a large area (3.5 $\times$ 2.2 cm$^ 2$) Joule heater for defrosting and defogging applications.

    • Author Affiliations

       

      SUNIL WALIA1 2 ASHUTOSH K SINGH1 VEENA S G RAO1 SURYASARATHI BOSE3 GIRIDHAR U KULKARNI1 4

      1. Centre for Nano and Soft Matter Sciences, Bengaluru 560013, India
      2. Manipal Academy of Higher Education, Manipal 576104, India
      3. Department of Materials Engineering, Indian Institute of Science, Bengaluru 560012, India
      4. Present Address: On lien from Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bengaluru 560064, India
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