Tensile Stress-Gated Electromagnetic Interference Shielding Fabrics with Real-Time Adjustable Shielding Efficiency

Abstract

Traditional electromagnetic interference (EMI) shielding films generally have constant shielding efficiencies that cannot respond to the real-time changing shielding requirements of smart wearable electronics. Here, we report a stress-gated EMI shielding fabric with a high elastic strain of 470% that exhibits variable shielding performance by stretching the fabric to different deformations. The fabric is fabricated through electroless plating Cu nanoparticles on the electrospun polyurethane nanofiber films, which can change from conducting to insulating when the stretch deformation reaches 50% and then back to conducting as the stress is released. The deformation causes repeated separation and contact of Cu nanoparticles on the surfaces of polyurethane nanofibers, resulting in a reversible transition between conducting and insulating. The fabric with tensile stress-gated conductivity can capture and weaken electromagnetic waves through absorption, reflection, and scattering, which shows real-time changing EMI shielding efficiencies from 0 to 52.31 dB. More importantly, the developed method of electroless plating for the deposition of continuous metal nanoparticles on elastic polyurethane nanofibers is new and scalable, which shows broad application prospects in smart EMI shielding fields.

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

“…However, the ε’’ and µ’’ values were relatively low, indicating a difficulty in transferring the electric and magnetic field forces [ 53 ]. The as-prepared fabrics exhibited a weak conductive ability, as shown in Figure 7 d,e, which could be attributed to the magnetite NdFe 2 O 4 NPs’ low interior motion of the magnetic dipole in varying magnetic fields for transferring electric fields, thus supporting the results in Figure 7 b,c [ 54 ]. In comparison with the existing samples, the fabrics with different NPs had little difference in their specific capacitance ( Cp ) values and dielectric constants.…”

Hydro-tunable CZTO/SWCNT/PVA/PDMS hybrid composites for smart green EMI shielding

“…For further comparison purposes, published research articles [32][33][34][35][36][37] for state-of-the-art externally tunable shielding responses are shown in Fig. 10 and the corresponding EMI SE values are summarized in Table S2 in the ESI.…”

Flexible Sandwich-Structured Co–Ni Alloy-Coated Basalt Fabrics via the Writing–Grafting–Activation–Deposition Process for Electromagnetic Interference Shielding and Electrothermal Conversion

“…Additionally, the BFSM sample in the absence of a porous structure demonstrates a lower SE T value (Figure S3). The comparisons among BFL 1.8 SM 30 samples and typical EMI shielding materials with respect to shielding performances are shown in Figure d, and it is observed that the BFL 1.8 SM 30 sample has a superior SE T value in the reported references. ,,− …”