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

Abstract

Gallium-based liquid metal (LM) with intriguing high electrical conductivity and room-temperature fluidity has attracted substantial attention for its potential application in flexible electromagnetic interference (EMI) shielding. However, the EMI shielding performance of the existing LM-based composites is unsatisfying due to the irreconcilable contradiction between high EMI shielding efficiency (SE) and low thickness. In addition, the research on environmentally stable EMI shielding material has become an urgent need due to the increasingly sophisticated application scenarios. Herein, we prepared a reduced graphene oxide (rGO) bridging LM layered heterostructure nanocomposite with the liquid-infused slippery surface (S-rGO/LM), which exhibits an ultrahigh X-band EMI SE of 80 dB at a mere internal thickness of 33 μm, and an extremely high value of 100 dB at an internal thickness of 67 μm. More significantly, protected by the ultrathin (2 μm) yet effective slippery surface, the S-rGO/LM film exhibits exceptional EMI shielding stability (EMI SE stays above 70 dB) after enduring various harsh conditions (harsh chemical environments, extreme operating temperatures, and severe mechanical wearing). Moreover, the S-rGO/LM film also demonstrates satisfying photothermal behavior and excellent Joule heating performance (surface temperature of 179 °C at 1.75 V, thermal response <10 s), which endows it with the capability of anti-icing/de-icing. This work proposes a way to construct an LM-based nanocomposite with reliable high-performance EMI shielding capability, which shows great potential for applications in wearable devices, defense, and aeronautics and astronautics.

Versatile chewed gum composites with liquid metal for strain sensing, electromagnetic interference shielding and flexible electronics

“…S8, ESI†), which meets the requirement of commercial shielding materials (∼20 dB). The theoretical EMI SE value of chewed gum was calculated using the Simon formula: 46 where σ (S cm −1 ) is the electrical conductivity, t (cm) is the coating thickness, and f (MHz) is the frequency. In principle, σ is the determining factor of the EMI SE of the chewed gum containing liquid metal at a fixed frequency and thickness.…”

Patterned liquid metal embedded in brush-shaped polymers for dynamic thermal management

“…Moreover, we compared the stress-strain data of LM-VGA/BPDMS with other previously reported materials in Fig. 2h, 5,15,18,[39][40][41][42][43][44][45][46][47][48][49][50] further highlighting the soft elasticity of our composites. Overall, the exceptional flexibility and ultralow elastic modulus of the material not only allow it to conform to interfaces with complex surface structures but also ensure thorough gap filling on the contact surface under low installation pressure conditions.…”

“…ESI †). [40][41][42] Additionally, the thermal stability of VGA/ BPDMS is characterized by TGA. VGA/BPDMS shows excellent thermal stability, with the T 95% value of the composite series being above 350 1C, making it suitable for high-temperature conditions (Fig.…”

Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

“…Electromagnetic interference (EMI) shielding materials, including carbon aerogels, , metallic materials, composite foams, , polymeric composites, − and cementitious composites, are booming. These materials possess high electrical conductivity, which plays a critical role to achieve high EMI shielding effectiveness (SE). − Moreover, the topological structure can significantly affect the materials’ EMI SE, for example, the gradient and/or sandwich structures were demonstrated to enhance the effectiveness by facilitating multiple reflections between parallel reflective planes. ,,, …”