Janus Polyurethane Composite Films with Aligned Graphene Fluoride and Liquid Metal for Improved Thermal Conductivity and Electromagnetic Interference Shielding
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The concept of Janus materials has enabled the development of multifunctional properties needed for advanced flexible electronics by forming a layered structure in polyurethane through the sedimentation of liquid metal (LM) and graphene fluoride (GF). A stretching-induced filler alignment technique was utilized to elongate and align the fillers within the polyurethane along the draw direction, resulting in simultaneous enhancements in in-plane thermal conductivity (9.62 W·m−1·K−1) and electromagnetic interference shielding effectiveness (55 dB). Moreover, the Janus composite film exhibited electrical conductivity on one side and insulation on the other side, highlighting the distinctive dual nature of the Janus materials. These findings suggest a novel approach to fabricating multifunctional composites for advanced flexible electronics. This research was supported by a grant from the Academic Research Program of Korea National University of Transportation in 2024.