Stiff, Thermally Stable and Highly Anisotropic Wood-Derived Carbon Composite Monoliths for Electromagnetic Interference Shielding

Abstract

Electromagnetic interference (EMI) shielding materials for electronic devices in aviation and aerospace not only need lightweight and high shielding effectiveness, but also should withstand harsh environments. Traditional EMI shielding materials often show heavy weight, poor thermal stability, short lifetime, poor tolerance to chemicals, and are hard-to-manufacture. Searching for high-efficiency EMI shielding materials overcoming the above weaknesses is still a great challenge. Herein, inspired by the unique structure of natural wood, lightweight and highly anisotropic wood-derived carbon composite EMI shielding materials have been prepared which possess not only high EMI shielding performance and mechanical stable characteristics, but also possess thermally stable properties, outperforming those metals, conductive polymers, and their composites. The newly developed low-cost materials are promising for specific applications in aerospace electronic devices, especially regarding extreme temperatures.

Ultra-light MXene aerogel/wood-derived porous carbon composites with wall-like “mortar/brick” structures for electromagnetic interference shielding

“…Shen et al [30] backfilled the epoxy resins into wood-derived carbon skeleton carbonized at 1200°C, and the epoxy/carbon composites had the average EMI SE value of 27.8 dB at X-band. Obviously, the EMI SE value of single carbonized wood skeleton was low and could hardly meet the actural requirement for superior EMI shielding performance [31,32]. Therefore, it is urgent to explore the ultra-light and strong wood-derived EMI shielding materials.…”

Bottom‐Up Ecofriendly Strategy for Construction of Sustainable Bacterial Cellulose Bioaerogel with Multifunctional Properties

“…The thermal conductivity was measured using thermal conductivity analyzer (Japan) via the steady‐state method. [ 26,35 ] Samples were prepared by cutting them into cubes with dimensions of 30 × 20 × 10 mm.…”

Lightweight and Construable Magnetic Wood for Electromagnetic Interference Shielding

“…[ 12 ] Yuan et al prepared a stiff, thermally stable, and highly anisotropic carbonized wood composite with EMI shielding effectiveness by incorporating silver nanowires (AgNWs). [ 13 ] Although the carbon composite is lightweight with good EMI shielding performance, AgNWs are expensive, and a high loading of AgNWs would result in complicated processing, large amounts of agglomerates, and poor mechanical strength.…”

“…[32] The remaining waves pass through the wood interconnected porous network, where they interact with the Fe 3 O 4 nanoparticles deposited on the inner surface of the lumen walls in the wood, which results in electromagnetic wave attenuation due to the enhanced magnetic loss tangent of the magnetic wood. [13,33] Further improvements to the magnetic properties may lead to enhance the EMI suppression capability. In addition, the mechanical properties of natural wood, delignified wood, and magnetic wood under the stretching process in the length direction are shown in Figure S9, Supporting Information.…”