Slippery Graphene-Bridging Liquid Metal Layered Heterostructure Nanocomposite for Stable High-Performance Electromagnetic Interference Shielding

Gallium-based liquid metal (LM) with intriguing highelectricalconductivity and room-temperature fluidity has attracted substantialattention for its potential application in flexible electromagneticinterference (EMI) shielding. However, the EMI shielding performanceof the existing LM-based composites is unsatisfying due to the irreconcilablecontradiction between high EMI shielding efficiency (SE) and low thickness.In addition, the research on environmentally stable EMI shieldingmaterial has become an urgent need due to the increasingly sophisticatedapplication scenarios. Herein, we prepared a reduced graphene oxide(rGO) bridging LM layered heterostructure nanocomposite with the liquid-infusedslippery surface (S-rGO/LM), which exhibits an ultrahigh X-band EMISE of 80 dB at a mere internal thickness of 33 & mu;m, and an extremelyhigh value of 100 dB at an internal thickness of 67 & mu;m. Moresignificantly, protected by the ultrathin (2 & mu;m) yet effectiveslippery surface, the S-rGO/LM film exhibits exceptional EMI shieldingstability (EMI SE stays above 70 dB) after enduring various harshconditions (harsh chemical environments, extreme operating temperatures,and severe mechanical wearing). Moreover, the S-rGO/LM film also demonstratessatisfying photothermal behavior and excellent Joule heating performance(surface temperature of 179 & DEG;C at 1.75 V, thermal response <10s), which endows it with the capability of anti-icing/de-icing. Thiswork proposes a way to construct an LM-based nanocomposite with reliablehigh-performance EMI shielding capability, which shows great potentialfor applications in wearable devices, defense, and aeronautics andastronautics.

Automated summary

The authors prepared a S-rGO/LM composite film with high electromagnetic shielding effectiveness and stability, which has potential applications in wearable devices, defense, and aeronautics and astronautics.