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Electromagnetic Shielding of Monolayer MXene Assemblies |
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| Authors: | Taeyeong Yun Hyerim Kim Aamir Iqbal Yong Soo Cho Gang San Lee Myung-Ki Kim Seon Joon Kim Daesin Kim Yury Gogotsi Sang Ouk Kim Chong Min Koo |
| Affiliation: | 1. National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, Daejeon, 34141 Korea;2. Materials Architecturing Research Centre, Korea Institute of Science and Technology (KIST), Seoul, 02792 Korea
KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841 Korea;3. Materials Architecturing Research Centre, Korea Institute of Science and Technology (KIST), Seoul, 02792 Korea Division of Nano and Information Technology, KIST School, University of Science and Technology, Daejeon, 34113 Korea;4. KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841 Korea;5. Materials Architecturing Research Centre, Korea Institute of Science and Technology (KIST), Seoul, 02792 Korea Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA, 19104 USA;6. Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA, 19104 USA;7. Materials Architecturing Research Centre, Korea Institute of Science and Technology (KIST), Seoul, 02792 Korea |
| Abstract: | Miniaturization of electronics demands electromagnetic interference (EMI) shielding of nanoscale dimension. The authors report a systematic exploration of EMI shielding behavior of 2D Ti3C2Tx MXene assembled films over a broad range of film thicknesses, monolayer by monolayer. Theoretical models are used to explain the shielding mechanism below skin depth, where multiple reflection becomes significant, along with the surface reflection and bulk absorption of electromagnetic radiation. While a monolayer assembled film offers ≈20% shielding of electromagnetic waves, a 24-layer film of ≈55 nm thickness demonstrates 99% shielding (20 dB), revealing an extraordinarily large absolute shielding effectiveness (3.89 × 106 dB cm2 g−1). This remarkable performance of nanometer-thin solution processable MXene proposes a paradigm shift in shielding of lightweight, portable, and compact next-generation electronic devices. |
| Keywords: | 2D materials electromagnetic interference shielding MXene nanomaterials self-assembly |