Facile fabrication of stacked rGO/MoS2 reinforced polyurethane composite foam for effective electromagnetic interference shielding. (March 2023)

• Record Type: Journal Article
• Authors: Sharma, Sushant; Pratap Singh, Bhanu; Hur, Seung Hyun; Choi, Won Mook; Chung, Jin Suk
• Is Part Of: Composites. Volume 166(2023)
• Publication Date: 2023-03
• Subjects: rGO/MoS2 stacked hybrid -- Polyurethane foam -- Water vapor induced phase separation (WVIPS) -- Electromagnetic interference (EMI) shielding -- Dynamic mechanical analysis (DMA); Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2022.107366
• Languages: English
• ISSNs: 1359-835X

Abstract

Graphical abstract: Highlights: Lightweight rGO/MoS2 reinforced TPU foam was prepared by a unique water vapor induced phase separation (WVIPS) technique. Stacked heterostructure of 2D fillers and porous architecture composite foam offer absorption dominant shielding. 3 mm thick 7 wt% rGO/MoS2 stacked heterostructure reinforced TPU foam exhibits maximum SSE of 117.2 dB.cm 3 /g. rGO/MoS2 /TPU foam also possesses excellent mechanical properties under static and dynamic uniaxial loading. WVIPS is useful for fabricating robust microcellular foam with complex filler reinforcement. 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.