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The applicability of graphite/metal‐oxide composite particles for electromagnetic interference shielding in an acrylic sheet

Astract This study investigated the applicability of graphite/metal‐oxide composite particles for electromagnetic interference (EMI) shielding in an acrylic sheet. Dry particle coating was performed to coat the powder of the metal‐oxide (such as CuO, or Fe2O3) on the surface of the artificial mesophase graphite powder (MGP). The MGP/ metal‐oxide composite particles were characterized using a scanning electron microscope (SEM) and an X‐ray powder diffractometer. The quasi‐solid acrylic sheet with (or without) MGP/metal‐oxide composite particles was fabricated using the method of water bath heating, and this quasi‐solid acrylic sheet was then solidified in a furnace. A network analyzer was utilized to measure the return and insertion losses of the electromagnetic wave as the electromagnetic wave penetrated an acrylic sheet with (or without) the MGP/metal‐oxide composite particles. At a fixed frequency of 1500 MHz, the insertion loss of the electromagnetic wave substantially increases from 34 dB in test D1 (a conventional acrylic sheet) to 41 dB in test D5 (an acrylic sheet with 0.3 g MGP/CuO composite particles). Most interestingly, at a fixed frequency of 2670 MHz and a fixed filler mass of 0.3 g, an acrylic sheet with MGP/CuO composite particles obviously possesses the capability to absorb and reflect the electromagnetic wave, but the absorption of the electromagnetic wave dominates the EMI shielding in an acrylic sheet with MGP/Fe2O3 composite particles.