Anticorrosive, Ultralight, and Flexible Carbon‐Wrapped Metallic Nanowire Hybrid Sponges for Highly Efficient Electromagnetic Interference Shielding

Abstract

Metal-based materials with exceptional intrinsic conductivity own excellent electromagnetic interference (EMI) shielding performance. However, high density, corrosion susceptibility, and poor flexibility of the metal severely restrict their further applications in the areas of aircraft/aerospace, portable and wearable smart electronics. Herein, a lightweight, flexible, and anticorrosive silver nanowire wrapped carbon hybrid sponge (Ag@C) is fabricated and employed as ultrahigh efficiency EMI shielding material. The interconnected Ag@C hybrid sponges provide an effective way for electron transport, leading to a remarkable conductivity of 363.1 S m and superb EMI shielding effectiveness of around 70.1 dB in the frequency range of 8.2-18 GHz, while the density is as low as 0.00382 g cm , which are among the best performances for electrically conductive sponges/aerogels/foams by far. More importantly, the Ag@C sponge surprisingly exhibits super-hydrophobicity and strong corrosion resistance. In addition, the hybrid sponges possess excellent mechanical resilience even with a large strain (90% reversible compressibility) and an outstanding cycling stability, which is far better than the bare metallic aerogels, such as silver nanowire aerogels and copper nanowire foams. This strategy provides a facile methodology to fabricate lightweight, flexible, and anticorrosive metal-based sponge for highly efficient EMI shielding applications.

Anisotropic MXene Aerogels with a Mechanically Tunable Ratio of Electromagnetic Wave Reflection to Absorption

“…The broken and buckled MXene bridges will lead to permanent (irreversible) deformation (Figure S6, Supporting Information). It is worth noting that these as‐prepared aerogels with high resilience are additive‐free, while polymer binders or supporting skeletons are usually utilized to improve the strength and elasticity of foams 4b. This is attributed to the long‐range ordered MXene lamellae and vertical supporting MXene bridges.…”

A self-assembled graphene/polyurethane sponge for excellent electromagnetic interference shielding performance

“…We have sufficient evidence to support that the two-step hydrothermal 3D graphene structure could not only interact with incoming EM waves but also enhance the internal multiple reection and scattering of EM waves at the large cell-matrix interfaces with impedance mismatch. [34][35][36][37] Thereby the attenuation of EM energy was realized by both conductive dissipation and multiple reections and scattering during EMI shielding. Our two-step hydrothermal method prepared an absorptiondominant EMI shielding 3D conductive graphene network for PUG foams.…”

Negative permittivity in titanium nitride‐alumina composite for functionalized structural ceramics

“…In addition, the decrease in σ ac with frequency resulted from the skin effect of current in ceramics, in other words, the increasing frequency enhanced the skin effect and σ ac decreased with the reduced skin depth. 39,40 Figure 4A. Meanwhile, ε′ was evidently improved when TiN content further increased due to the increase in TiN-Al 2 O 3 interfaces.…”