Abstract
The achievement of favorable electromagnetic interference shielding at low filler loading integrated with good durability, excellent flexibility is still a great challenge for flexible and wearable electric devices. Herein, graphene nanosheets (GNSs) wrapped melamine foam (MF) (GNSs@MF) is successfully fabricated by repeated dip-drying method using MF skeleton as substrate. The resultant scaffold with interconnected GNSs layer is further infiltrated with thermoplastic polyurethane (TPU). Benefiting from such unique three-dimensional (3D) electrically conductive network, a high electrical conductivity of 45.2 S/m and an exceptional electromagnetic interference (EMI) shielding effectiveness (EMI SE) of 35.6 dB in the X-band are achieved at only 2.01 vol% GNSs loading and 2 mm thickness of TPU-GNSs@MF composites. Importantly, the excellent EMI SE is reliable even the prepared composites undergoing vigorous physical, chemical damages and long-term compression cycles due to the protection of TPU layer and inherent elasticity of MF. In view of the prominent comprehensive performance of the TPU-GNSs@MF composites, this work provides a facile and scalable fabrication of highly-efficient EMI shielding composites for the next-generation portable and wearable electronic devices.
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