In recent decades, problems with electromagnetic interference (EMI) radiation problems have arisen, that can seriously reduce the performance of precision devices nearby and threaten human health. In consequence, it is...
Highly
efficient electrical heaters along with excellent electromagnetic
interference (EMI) shielding properties are urgently required for
the progress of miniaturization electronics, artificial intelligence,
and smart heating management setups. Herein, lignin removal, which
comprises two efficient and versatile steps, followed by carbonization
produces multifunctional carbon monoliths derived from natural wood.
The obtained carbonized wood exhibits a high specific surface area
(655.14 m2/g) and electrical (17.5 S/cm) and thermal conductivity
(0.58 W/m·K), superhydrophilicity (contact angle of ∼0°),
and excellent EMI shielding ability and Joule heating performance.
The high electrical conductivity renders a low-voltage-actuated Joule
heating performance and fascinating EMI shielding effectiveness of
55 dB, primarily resulting from the absorption mechanism. Moreover,
regulation of the carbonized woods derived from the longitudinal to
the radial direction enables transformation of hydrophilicity, strong
thermal conductivity, and absorption-dominated EMI shielding to hydrophobicity,
thermal insulation, and reflection-dominated EMI shielding. This is
attributed to the unique anisotropic microstructure of carbon scaffolds.
It is believed that these multifunctional carbon scaffolds can be
used for intelligent electronics, EMI shielding, and thermal heating
instruments.
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