Search

Carbon nanomaterials have received extensive academic attention in the field of electromagnetic interference (EMI) shielding due to their light weight and high electrical conductivity. Employing one-dimensional carbon tubes to construct macro-assembly EMI shielding material architectures accompanied by generating pores in materials remains crucial. Herein, we employed a new type of carbon tube with a whisker structure and excellent electrical conductivity, named as whisker CT (wCT), and used graphene oxide (GO) as a bridging and foaming agent to achieve a porous reduced graphene oxide/wCT film (rGWF) by the vacuum-assisted filtration and annealing process. The rGWF with an average thickness of ∼30 μm exhibited outstanding electrical conductivity of 4.96 × 103 S/m and excellent EMI shielding effectiveness of 45–58 dB in the broad frequency range of 8.2–40 GHz. In addition, EM simulation was conducted by using the COMSOL software, and it confirmed that the porous structures induced by GO during the thermal reduction process changed the polarization direction and distribution of the electric field of attenuated EM waves. Moreover, the remarkable near-field shielding performance of 25–50 dB in the frequency range of 1–9 GHz was evaluated, which demonstrates the potential application of rGWF in electronic packaging. [ABSTRACT FROM AUTHOR]

Correction for 'Electromagnetic interference shielding materials: recent progress, structure design, and future perspective' by Xiao-Yun Wang et al., J. Mater. Chem. C, 2022, 10, 44–72, https://doi.org/10.1039/D1TC04702G. [ABSTRACT FROM AUTHOR]

Developing lightweight composite with reversible switching between microwave (MW) absorption and electromagnetic interference (EMI) shielding is promising yet remains highly challenging due to the completely inconsistent attenuation mechanism for electromagnetic (EM) radiation. Here, a lightweight vanadium dioxide/expanded polymer microsphere composites foam (VO 2 /EPM) is designed and fabricated with porous structures and 3D VO 2 interconnection, which possesses reversible switching function between MW absorption and EMI shielding under thermal stimulation. The VO 2 /EPM exhibits MW absorption with a broad effective absorption bandwidth of 3.25 GHz at room temperature (25 °C), while provides EMI shielding of 23.1 dB at moderately high temperature (100 °C). This reversible switching performance relies on the porous structure and tunability of electrical conductivity, complex permittivity, and impedance matching, which are substantially induced by the convertible crystal structure and electronic structure of VO 2 . Finite element simulation is employed to qualitatively investigate the change in interaction between EM waves and VO 2 /EPM before and after the phase transition. Moreover, the application of VO 2 /EPM is demonstrated with a reversible switching function in controlling wireless transmission on/off, showcasing its excellent cycling stability. This kind of smart material with a reversible switching function shows great potential in next-generation electronic devices., (© 2024 Wiley‐VCH GmbH.)