Compressible, durable and conductive polydimethylsiloxane-coated MXene foams for high-performance electromagnetic interference shielding

Electromagnetic wave absorbing materials play an increasingly important role in consumer electronics and military defense. The remarkable merits of atomically thin graphene structures and their exotic optoelectronic properties provide new opportunities to design high‐performance electromagnetic wave absorbers. This progress report summarizes the recent advances in graphene‐based microwave and terahertz stealth materials. In the first section, the theory of electromagnetic wave absorption and the evaluation methods for absorption performance are briefly introduced. Then, representative graphene‐based microwave and terahertz absorber systems are presented with an emphasis on the selection of the absorbent component and structural design. In the last section, the perspectives and future research directions of this promising field are discussed.

Graphene-Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Rational design of two-dimensional nanofillers for polymer nanocomposites toward multifunctional applications

Multifunctional flexible carbon black/polydimethylsiloxane piezoresistive sensor with ultrahigh linear range, excellent durability and oil/water separation capability

Highly expansive, thermally insulating epoxy/Ag nanosheet composite foam for electromagnetic interference shielding

Integrating ultralight weight and strong mechanical performance into cellular monolith is a challenge unresolved yet. Here, we propose a skeleton-assisted self-assembly method to design ultralight bicontinuous composite foams (BCCFs) with high mechanical robustness and ultralow percolation thresholds. Polymer foam was employed as the skeleton to support assembled graphene networks, forming BCCFs with a high tensile strength (∼80 kPa) and breakage elongation (>22.2%). The paraffin and poly(dimethylsiloxane) infiltrated BCCFs show a record low percolation threshold of 0.006 vol % and a relatively high electrical conductivity of 0.81 S m–1 at a low graphene content of 0.216 vol %. The BCCFs demonstrate high and adjustable microwave-absorbing (MA) properties. The effective absorption bandwidth (reflection loss ≤ −10 dB) for BCCFs with a low graphene loading of 3.4 mg cm–3 achieves 9.0 GHz at a thickness of 4 mm, and it further covers 13.6 GHz considering the adjustability of preferred absorption band. The BCC...

Multifunctional Bicontinuous Composite Foams with Ultralow Percolation Thresholds.

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Multifunctional Bicontinuous Composite Foams with Ultralow Percolation Thresholds.