Carbonized Wood/Nickel Nanoparticle Composites with Oriented Channels for Enhanced Electromagnetic Interference Shielding

Abstract

The multiple enhancement of electromagnetic interference (EMI) shielding performance through facile operation is attractive for the future development of EMI shielding materials. Herein, composites of carbonized wood and nickel (CW/Ni) with different orientation angles are obtained by impregnation and carbonization. Benefiting from the through-pore structure, the shielding effectiveness (SE) of CW rises from 29.3 to 57.5 dB in the X-band as the orientation angle shifts from 90 to 0°. Moreover, the orientation angle of the natural wood has an influence on the impregnation results. CW/Ni-0° has the highest nickel content in the same impregnation condition, and the SE value of CW/Ni-0° is further improved to 76.4 dB in the X-band owing to an increase in internal reflection, graphitization, and magnetic loss. CW/Ni-0° achieves high SSE and SSE/t via modulation of orientation angles. This work provides an effective approach to enhance the performance of shielding materials.