Fabrication of reduced graphene oxide (RGO) and nanocomposite with thermoplastic polyurethane (TPU) for EMI shielding application

Nanocomposites based on thermoplastic polyurethane (TPU) and reduced graphene oxide (RGO) were fabricated to increase electromagnetic interference (EMI) shielding. The RGO effect on electrical conductivity was measured, and the results indicated an increase in electrical conductivity by increasing the graphene content. The dielectric parameters also enhanced at the frequency range of 100 Hz to 5 MHz. EMI shielding properties were evaluated in microwave range (11 GHz to 20 GHz) and also in near-infrared (NIR) wavelength range (700–2500 nm). The maximum shielding effectiveness obtained was 53 dB with the addition of 2.5% RGO. The increase in shielding effectiveness mainly achieved in the frequency range of 12–14 GHz. Transmission observed in IR region was less than 0.5%. The main reason for increasing the EMI shielding of nanocomposites is nature of filler, interaction of filler with matrix of polymer and the dispersion state.