High-Compressive,\nElastic, and Wearable Cellulose\nNanofiber-Based Carbon Aerogels for Efficient Electromagnetic Interference\nShielding

Abstract

Developing excellent electromagnetic interference (EMI)\nshielding\nmaterials with robust EMI shielding efficiency (SE), high mechanical\nperformance, and multifunctionality is imperative. Carbon materials\nare well recognized as promising alternatives for high-performance\nEMI shielding, but their high brittleness greatly hampers their applications.\nIn this work, a cellulose nanofiber/reduced graphene oxide-glucose\ncarbon aerogel (C–CNFs/rGO-glu) with high compression, elasticity,\nand excellent EMI shielding performance was fabricated by directional\nfreeze-drying followed by carbonization. Specifically, the height\nand stress retention are 88% and 90.9%, respectively, after 100 cycles\nof compression release at a high strain of 70%. The electromagnetic\nshielding effectiveness of the aerogels reached 67.5 dB and presented\nan absorption-dominant shielding mechanism with a 97.5% absorption\nloss ratio. Further, the carbon aerogel could capture subtle electrical\nsignals to monitor different human behaviors and showed excellent\nheat insulation and infrared stealth performance.