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Polydopamine coating improves electromagnetic interference shielding of delignified wood-derived carbon scaffold

  • Composites & nanocomposites
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Abstract

Delignified wood (DW) is natural wood’s cellulosic skeleton. It has highly ordered anisotropic architecture, permitting solute accessibility to modify its abundant interior surfaces. Herein, we demonstrate a facile method to coat polydopamine (PDA) conformally on DW’s interior surfaces. The PDA layer not only introduced heteroatom (N), but also facilitated the generation of silver particles by in situ reduction. The prepared DW skeletons were freeze-dried and pyrolyzed at 850/1200 °C to create carbonized DW (CDW) and then embedded in the epoxy matrix to prepare a composite for the application of electromagnetic interference (EMI) shielding. It was found that the PDA coating converted to a highly conductive carbon species on the surface of a DW-derived carbon scaffold. As a result, the PDA modification increased the electrical conductivity (EC) of the plain epoxy/CDW from 0.32 to 0.46 S/m, and accordingly the EMI shielding effectiveness (SE) increased from 18.2 dB for epoxy/CDW to 24.0 dB for epoxy/CDW-PDA, and 30.6 dB for epoxy/CDW-Ag. This work provides a facile and universal methodology to enhance the EC and EMI SE performance of open-porous carbon.

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Acknowledgements

The authors would like to acknowledge the financial support by the USDA National Institute of Food and Agriculture, AFRI project [contract#2016-67021-25016], US Endowment for Forestry and Communities [grant number: E17-18], Robert Patrick Jenkins Professorship, and Dean’s Faculty Fellow Professorship. Ting Zheng would like to acknowledge partial financial support provided by Cooper-Standard Postdoctoral Fellowship.

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Authors and Affiliations

  1. Department of Automotive Engineering, Clemson University, 4 Research Drive, Greenville, SC, 29607, USA

    Ting Zheng, Seyed Morteza Sabet & Srikanth Pilla

  2. Clemson Composites Center, Clemson University, Greenville, SC, 29607, USA

    Ting Zheng, Seyed Morteza Sabet & Srikanth Pilla

  3. Department of Materials Science and Engineering, Clemson University, Clemson, SC, 29602, USA

    Srikanth Pilla

  4. Department of Mechanical Engineering, Clemson University, Clemson, SC, 29602, USA

    Srikanth Pilla

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  1. Ting Zheng
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Correspondence to Srikanth Pilla.

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10853_2021_6007_MOESM1_ESM.docx

Fig S1–S3: preliminary study including the preparation of DW/PPy and DW/MWCNT and their SEI shielding performance. Figure S4: SEM images of wood, CDW, CDW-PDA and CDW-Ag; Fig S5. Cross section of PDA-treated DW after 2 h and 24 h; Fig S6: \({\mathrm{SE}}_{T}\), \({\mathrm{SE}}_{R}\), and \({\mathrm{SE}}_{A}\) of epoxy/CDW, epoxy/CDW-PDA, and epoxy/CDW-Ag; Fig S7. \({\mathrm{SE}}_{A}\)% (\({\mathrm{SE}}_{A}\)/\({\mathrm{SE}}_{T}\)) of composites from porous carbons carbonized at 850 °C and 1200 °C; Table S1: dimension and density of specimens. Table S2. Atom percentage of DW-Ag over depth on its cross section (by XPS); Table S3 and S4: EMI SE performance of biomass-based porous carbon and carbon-filled CPC (DOCX 8444 kb)

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Zheng, T., Sabet, S.M. & Pilla, S. Polydopamine coating improves electromagnetic interference shielding of delignified wood-derived carbon scaffold. J Mater Sci 56, 10915–10925 (2021). https://doi.org/10.1007/s10853-021-06007-9

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  • DOI: https://doi.org/10.1007/s10853-021-06007-9

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