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Vol. 15 (2023)

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

https://doi.org/10.1007/s40820-023-01157-8
Jin Soo Lee
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Jeong‑Wook Kim
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Jae Hee Lee
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Yong Koo Son
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Young Bin Kim
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Kyoohee Woo
Department of Printed Electronics, Nano‑Convergence Manufacturing Systems Research Division, Korea Institute of Machinery and Materials (KIMM), 156 Gajeongbuk‑Ro, Yuseong‑Gu, Daejeon 34103, Republic of Korea
Chanhee Lee
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Il‑Doo Kim
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Jae Young Seok
Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, 232 Gongneung‑ro, Nowon‑gu, Seoul 01811, Republic of Korea
Jong Won Yu
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea
Jung Hwan Park
Department of Mechanical Engineering (Department of Aeronautics, Mechanical and Electronic Convergence Engineering), Kumoh National Institute of Technology, 61 Daehak‑ro, Gumi, Gyeongbuk 39177, Republic of Korea
Keon Jae Lee
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak‑ro, Yuseong‑gu, Daejeon 34141, Republic of Korea

Corresponding Author: Keon Jae Lee

keonlee@kaist.ac.kr

Nano-Micro Letters, Vol. 15 (2023), Article Number: 191

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.


Highlights:
1 Flash-induced porous graphene (FPG) was synthesized via a broad-spectrum flash lamp that induced synergistic photo-effects between ultraviolet and visible-near-infrared wavelengths, resulting in large-area synthesis in just a few milliseconds.
2 A hollow pillar graphene with low sheet resistance of 18 Ω sq−1 was produced, exhibiting low density (0.0354 g cm−3) and outstanding absolute electromagnetic interference shielding effectiveness of 1.12 × 105 dB cm2 g−1.
3 A lightweight, flexible, and high-throughput FPG is applied for electromagnetic interference shielding of a drone radar system and the human body.

Keywords

Porous graphene Flash lamp Photo-pyrolysis High-throughput Electromagnetic interference shielding
Lee, Jin Soo, Jeong‑Wook Kim, Jae Hee Lee, Yong Koo Son, Young Bin Kim, Kyoohee Woo, Chanhee Lee, Il‑Doo Kim, Jae Young Seok, Jong Won Yu, Jung Hwan Park, and Keon Jae Lee. 2023. “Flash-Induced High-Throughput Porous Graphene via Synergistic Photo-Effects for Electromagnetic Interference Shielding”. Nano-Micro Letters 15 (August):191. https://doi.org/10.1007/s40820-023-01157-8.
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