Abstract
Woodceramics were fabricated in a vacuum through carbonization of wood powder impregnated with phenol formaldehyde (PF) resin. The effects of carbonization temperature and mass ratio of wood/resin on electromagnetic interference (EMI) shielding effectiveness (SE) and morphology of woodceramics were explored. The PF resin made wood cell walls have the characteristics of glassy carbon. Wood axial tracheid and ray cells were filled with more glassy carbon by increasing addition of PF resin. Moreover, the increase of carbonization temperature was beneficial to improving SE. Woodceramics (mass ratio 1:1) obtained at 1000 °C presented a medium SE level between 30 MHz and 1.5 GHz.
Highlights
Electromagnetic interference (EMI) occurs when electronic devices are disturbed by unwanted electromagnetic radiation
EMI shielding refers to reflecting and/or absorbing electromagnetic radiation by a material that acts as a barrier
The findings suggested the potential utilization of woodceramics for EMI
Summary
Electromagnetic interference (EMI) occurs when electronic devices are disturbed by unwanted electromagnetic radiation. EMI shielding refers to reflecting and/or absorbing electromagnetic radiation by a material that acts as a barrier. EMI shielding mechanisms include reflection, absorption, and multiple reflections. In order to achieve a significant absorption rate, the barrier should have electric and/or magnetic dipoles that interact with the electromagnetic radiation fields. The third mechanism is multiple reflections, which refers to reflections at various surfaces or interfaces in the shield. This mechanism requires the presence of large surface areas or interfaces within the shield. Examples of this kind of shielding are composite materials containing fillers with large surface areas. The loss due to multiple reflections can be neglected when the distance between the reflecting surfaces or interfaces is greater than the skin depth
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