Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding

Abstract

Porous 2D materials with high conductivity and large surface area have been proposed for potential electromagnetic interference (EMI) shielding materials in future mobility and wearable applications to prevent signal noise, transmission inaccuracy, system malfunction, and health hazards. Here, we report on the synthesis of lightweight and flexible flash-induced porous graphene (FPG) with excellent EMI shielding performance. The broad spectrum of pulsed flashlight induces photo-chemical and photo-thermal reactions in polyimide films, forming 5 × 10 cm2-size porous graphene with a hollow pillar structure in a few milliseconds. The resulting material demonstrated low density (0.0354 g cm−3) and outstanding absolute EMI shielding effectiveness of 1.12 × 105 dB cm2 g−1. The FPG was characterized via thorough material analyses, and its mechanical durability and flexibility were confirmed by a bending cycle test. Finally, the FPG was utilized in drone and wearable applications, showing effective EMI shielding performance for internal/external EMI in a drone radar system and reducing the specific absorption rate in the human body.

MoS2-Based Nanocomposites for Microwave Absorption: A Review

“…129,130 Second, they could be used to reduce the radiation and noise of various electronic equipment. 131 Then they could reduce the low frequency coupling conduction radiation interference, the low frequency echo interference and the internal electromagnetic interference such as resonance and crosstalk in the barrier frame. 132 Besides, they could be also applied between the chip and the cooling module.…”

“…At first, they could be used in the internal cavity of electronic equipment such as laptop computers, mobile phones, communication cabinets, etc. , Second, they could be used to reduce the radiation and noise of various electronic equipment . Then they could reduce the low frequency coupling conduction radiation interference, the low frequency echo interference and the internal electromagnetic interference such as resonance and crosstalk in the barrier frame .…”

Highly Conducting Surface-Silverized Aromatic Polysulfonamide (PSA) Fibers with Excellent Performance Prepared by Nano-Electroplating

“…In general, when using vector networks to measure EMI SE, the total shielding efficiency (SET) is composed of reflection (SER) and absorption (SEA), which can be calculated by measuring the scattering coefficient. The EMI shielding efficiency satisfies the following equations [58,59]: R = |S11| 2 (1)…”

Microstructure regulation and microwave absorption properties of ZnO/RGO composites

“…Research shows that the shorter the wavelength or the longer the exposure time of the human body to radiation, the greater the harm to the human body, which causes various diseases and health problems. 7–10 In the electronic equipment of key industries such as security and secrecy systems, critical control systems, diplomacy, life and health, eliminating or minimizing microwave interference is the key technology to prevent information leakage and electromagnetic interference. 11,12…”