Highly Anisotropic Carbonized Wood as Electronic Materials for Electromagnetic Interference Shielding and Thermal Management

Lightweight carbonized wood has a hierarchically 3D porous framework and orthotropic channels along the growth direction, which demonstrate great potential for multifunctional electronic materials. Herein, with outstanding electromagnetic interference (EMI) shielding effectiveness (SE), high thermal conductivity, excellent Joule heating property is fabricated. It also exhibits highly anisotropic EMI performance in cross- tangential-sections. In tangential-section, of tuned by monitoring angle between grain electric field vibration direction waves, SE value ranges from 29 to 77 dB when changes 90° 0°. Benefiting obtained structural optimization low density, balsa displays SSE (the ratio density) SSE/t thickness) 1069 cm3 g−1 3263 cm2 g−1, respectively. The conductivity angle-dependent, 0.865 1.897 W m−1 K−1. With improvement can be used as heat sink material. Meanwhile, properties are achieved due effective conductive pathway wood.