Facile fabrication of stacked rGO/MoS2 reinforced polyurethane composite foam for effective electromagnetic interference shielding

Abstract

Herein, a unique approach of water vapor-induced phase separation is adopted to prepare a microcellular structure of stacked rGO/MoS2 reinforced TPU foam. Hydrothermally prepared rGO/MoS2 heterostructure prevents the restacking of nanosheets and assists in effective reinforcement in TPU system. The specific shielding performance of different concertation of 2D filler-reinforced composite foams is determined in the X-band (8.2–12.4 GHz) frequency range. The 7 wt% rGO/MoS2/TPU foam having a thickness of 3 mm showed total shielding effectiveness of ∼32 dB, which is 28 % and 166 % higher than 7 wt% rGO and MoS2 reinforced foams. The electric-dipoles and excellent carrier-hopping caused due to stacked-heterostructure and multiple internal reflections due to the microcellular architecture of foam helped in manifesting the maximum wave attenuation (99.9 %) and leads to an outstanding synergistic absorption effect (92 % of SET). Additionally, it improved the thermomechanical and tensile properties of composite foams over rGO and MoS2 reinforced foams, and make them viable for practical applications.