Robust and Stable Cu Nanowire@Graphene Core–Shell Aerogels for Ultraeffective Electromagnetic Interference Shielding

Abstract

Cu nanowires (CuNWs) are considered as a promising candidate to develop high performance metal aerogels, yet the construction of robust and stable 3D porous structures remains challenging which severely limits their practical applications. Here, graphene-hybridized CuNW (CuNW@G) core-shell aerogels are fabricated by introducing a conformal polymeric coating and in situ transforming it into multilayered graphene seamlessly wrapped around individual CuNWs through a mild thermal annealing process. The existence of the outer graphene shell reinforces the 3D bulk structure and significantly slows down the oxidation process of CuNWs, resulting in improved mechanical property and highly stable electrical conductivity. When applied in electromagnetic interference shielding, the CuNW@G core-shell aerogels exhibit an average effectiveness of ≈52.5 dB over a wide range (from 8.2 to 18 GHz) with negligible degradation under ambient conditions for 40 d. Mechanism analysis reveals that the graphene shell with functional groups enables dual reflections on the core-shell and a multiple dielectric relaxation process, leading to enhanced dielectric loss and energy dissipation within the core-shell aerogels. The flexible core-shell-structured CuNW@G aerogels, with superior mechanical robustness and electrical stability, have potential applications in many areas such as advanced energy devices and functional composites.

Flexible PEBAX/graphene electromagnetic shielding composite films with a negative pressure effect of resistance for pressure sensors applications

“…Thus, the compressibility of CPCs should be rstly considered when one wants to obtain high-efficiency EMI shielding ability. Encouragingly, there are several publications about compressive behavior of EMI shielding materials under force stimulation, such as carbon-wrapped metallic Ag nanowire hybrid sponges, 16 Cu nanowire@graphene core-shell aerogels, 17 porous multiwalled carbon nanotube/water-borne polyurethane composites, 18 light graphene foams, 19,20 and carbon nanotube-multilayered graphene edge plane core-shell hybrid foams. 21 These materials exhibited exceptional EMI shielding properties along with superior compressibility, which renders their great potential as promising candidates for highperformance EMI shielding in exible electronic devices.…”

Uniform Distribution of Alloying/Dealloying Stress for High Structural Stability of an Al Anode in High‐Areal‐Density Lithium‐Ion Batteries

“…65‐2869) and Cu (JCPDS Card No. 04‐0836) . Energy dispersive X‐ray spectroscopy (EDS) mappings (Figure S2, Supporting Information) indicated that Cu and Al distributed homogenously in this nanocomposite film.…”

Compressible Metalized Soft Magnetic Sponges with Tailorable Electrical and Magnetic Properties

“…Recently, the resilience of lightweight porous materials has received enormous attention in some emerging materials, like graphene aerogel or nanosponges, [17] carbon nanotubes aerogel, [18] nanofiber-based aerogel, [19] metallic nanowires aerosponges. [20] Attributed to high pressure-sensitivity and good resilience, those materials could be applied to ultrasensitive sensors, [21] reusable pollutant absorbers, [22] high-efficiency mechanical damper, [23] or adjustable microwave inhibitor. [24,25] Apparently, the resilience of the sponge has been an important factor for expanding the functionalities of materials, enhancing the performance of components and prolonging the service lifetime of devices.…”

“…However, although porous metallic sponges have been studied for many years, little attention was paid to the research about the resilience of metallic sponges attributed to the inherent plastic nature of metal. Recently, the resilience of lightweight porous materials has received enormous attention in some emerging materials, like graphene aerogel or nanosponges, carbon nanotubes aerogel, nanofiber‐based aerogel, metallic nanowires aerosponges . Attributed to high pressure‐sensitivity and good resilience, those materials could be applied to ultrasensitive sensors, reusable pollutant absorbers, high‐efficiency mechanical damper, or adjustable microwave inhibitor .…”