A unique freestanding nickel (Ni) metallic mesh–based electromagnetic interference shielding film has been fabricated though the direct-writing technique and a subsequent selective metal electrodeposited process. The structured freestanding Ni mesh film demonstrates a series of advantages, including ultrathin thickness (2.5-6.0 μm) and ultralight weight (0.23 mg cm−2), extraordinary optoelectronic performance (sheet resistance about 0.24-0.7 Ω sq−1 with transparency of 92%–93%), high figure of merit (18000) and outstanding flexibility as it can withstand folding, rolling and crumpling into various shapes while keeping the conductivity constant. Furthermore, by using this high-performance Ni mesh, an ultrathin, lightweight, freestanding and transparent electromagnetic interference shielding (EMI) film with extraordinary optoelectronic properties (shielding effectiveness about 40 dB with transparency of 92%) is demonstrated in X-band, with no performance attenuation observed even in bending state. This freestanding metallic mesh–structured electrode can be further explored or applied in various potential applications, such as conformal microwave antennas, transparent EMI windows, and wearable electronics.

Ultrathin, lightweight, and freestanding metallic mesh for transparent electromagnetic interference shielding

The development of flexible and transparent electromagnetic interference (EMI) shielding materials with excellent comprehensive properties is urgently demanded as visual windows and display devices in aeronautic, industry, medical, and research facilities. However, the method of how to obtain highly efficient and reliable transparent EMI shielding devices is still facing lots of obstacles. Here, a high-performance silver nanotube (AgNT) network with stable and integrated interconnects is prepared by physical depositing technology, based on a uniform and large-scale nanofiber skeleton. This unique structure enables the AgNT network to achieve one order higher conductivity (∼1.0 Ω/sq at >90% transmittance) than previous research studies and keeps 5000 times). Moreover, the manufactured AgNT shielding film with a thickness of less than 1 mm can be easily transferred to arbitrary surfaces as a transparent and flexible EMI shielding film at commercial ∼35 dB EMI shielding effectiveness, with large-scale, low-cost, and simple preparation processes. These excellent properties endow the AgNT shielding film to achieve great potential for future flexible and transparent scenarios.

High-Performance and Reliable Silver Nanotube Networks for Efficient and Large-Scale Transparent Electromagnetic Interference Shielding.

In this work, we present efficient, robust, and transparent electromagnetic interference (EMI) shielding by a hybrid material comprised of a nickel (Ni) mesh and a conformal graphene coating We de

Electromagnetic Interference Shielding by Transparent Graphene/Nickel Mesh Films

Electromagnetic interference protection in optoelectronic devices is challenging because of the dual requirements of optical transmittance and high shielding effectiveness (SE). Herein, we propose a novel silver nanowire (AgNW)/polyethylene terephthalate (PET) multi-layer mesh pattern structure for transparent electromagnetic shielding obtained via laser marking and transfer printing. A three-layer composite shielding film with an optical transmittance of 67.8% exhibits a SE of 44 dB at 10 GHz, which is superior to most of the reported transparent shielding films composed of AgNWs to date. The newly designed multi-layer composite structure can enhance the transparent shielding properties of the shielding film via optimization of the AgNW distribution and the shielding film structure. It is expected that this multi-layer mesh composite structure will have splendid application prospects in electromagnetic shielding films, which require both light transmittance and high SE.

https://iopscience.iop.org/article/10.1088/1361-6528/ab6d9d/pdf

Multi-layer silver nanowire/polyethylene terephthalate mesh structure for highly efficient transparent electromagnetic interference shielding.

An excellent transparent electromagnetic interference (EMI) shielding window is proposed and demonstrated theoretically and experimentally The window is composed of double layers of Au–Ni composite mesh, separated by the quartz-glass substrate The simulation exhibits that the shielding effectiveness (SE) of the double-layer mesh can be improved by increasing the thickness of the substrate in the low frequency range far below the first interfere valley The measured SE of the proposed structure reaches over 3761 dB covering an ultra-wide frequency ranging from 150 MHz to 5 GHz, with a maximal SE of 7584 dB at 358 GHz, while the average optical transmittance of the double-layer mesh maintains ∼7635% at 400–900 nm Moreover, femtosecond laser direct writing processing technology is used to manufacture the double-layer metal grids, the fabricated grids are not easy to be scuffed off and has a longer operating life Such a high-performance EMI shielding window has great potential applications in precision optical monitoring instrument and military devices

/pdf/double-layer-metal-mesh-etched-by-femtosecond-laser-for-high-57h6u1kqdw.pdf

Double-layer metal mesh etched by femtosecond laser for high-performance electromagnetic interference shielding window

Transparent conductive Ta/Al/Ta-grid electrode for optoelectronic and electromagnetic interference shielding applications

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Transparent conductive Ta/Al/Ta-grid electrode for optoelectronic and electromagnetic interference shielding applications