Polydopamine coating improves electromagnetic interference shielding of delignified wood-derived carbon scaffold
Source abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electromagnetic wave absorption materials · Advanced Antenna and Metasurface Technologies · Natural Fiber Reinforced Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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