Enhanced polarization <i>via</i> Joule heating in wood-derived carbon materials for absorption-dominated EMI shielding

Feng, Haoyang; Hong, Jianming; Zhang, Jiaxiang; He, Pingping; Zhou, Honghai; Wang, Sai; Xing, Hongna; Li, Ruosong

doi:10.1039/d3mh01332d

Cited by 11 publications

References 60 publications

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Absorption‐Dominant Electromagnetic Interference (EMI) Shielding across Multiple mmWave Bands Using Conductive Patterned Magnetic Composite and Double‐Walled Carbon Nanotube Film

Park,

Hwang,

Lee

et al. 2024

Adv Funct Materials

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The revolution of millimeter‐wave (mmWave) technologies is prompting a need for absorption‐dominant EMI shielding materials. While conventional shielding materials struggle in the mmWave spectrum due to their reflective nature, this study introduces a novel EMI shielding film with ultralow reflection (<0.05 dB or 1.5%), ultrahigh absorption (>70 dB or 98.5%), and superior shielding (>70 dB or 99.99999%) across triple mmWave frequency bands with a thickness of 400 µm. By integrating a magnetic composite layer (MCL), a conductive patterned grid (CPG), and a double‐walled carbon nanotube film (DWCNTF), specific resonant frequencies of electromagnetic waves are transmitted into the film with minimized reflection, and trapped and dissipated between the CPG and the DWCNTF. The design factors for resonant frequencies, such as the CPG geometry and the MCL refractive index, are systematically investigated based on electromagnetic wave propagation theories. This innovative approach presents a promising solution for effective mmWave EMI shielding materials, with implications for mobile communication, radar systems, and wireless gigabit communication.

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Absorption‐Dominant Electromagnetic Interference (EMI) Shielding across Multiple mmWave Bands Using Conductive Patterned Magnetic Composite and Double‐Walled Carbon Nanotube Film

Park,

Hwang,

Lee

et al. 2024

Adv Funct Materials

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Transparent electromagnetic interference shielding materials using MXene

Deng,

Chen,

Liu

et al. 2024

Carbon Energy

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With the rapid advancement of terahertz technologies, electromagnetic interference (EMI) shielding materials are needed to ensure secure electromagnetic environments. Enormous efforts have been devoted to achieving highly efficient EMI shielding films by enhancing flexibility, lightweight, mechanical robustness, and high shielding efficiency. However, the consideration of the optical properties of these shielding materials is still in its infancy. By incorporating transparency, visual information from protected systems can be preserved for monitoring interior working conditions, and the optical imperceptibility allows nonoffensive and easy cover of shielding materials for both device and biology. There are many materials that can be applied to transparent EMI shields. In particular, two‐dimensional transition metal carbide/nitrides (MXenes), possessing the advantages of superior conductivity, optical properties, favorable flexibility, and facile processibility, have become a great candidate. This work reviews the recent research on developing highly efficient and optically transparent EMI shields in a comprehensive way. Materials from MXenes, indium tin oxide, metal, carbon, and conductive polymers are covered, with a focus on the employment of MXene‐based composites in transparent EMI shielding. The prospects and challenges for the future development of MXene‐based transparent EMI shields are discussed. This work aims to promote the development of high‐performance, optically transparent EMI shields for broader applications by leveraging MXenes.

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Nanotechnology in Defense and Social Justice: Opportunities and Risks

Suja,

Mathiya

2024

Advanced Technologies and Societal Change

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Enhanced polarization via Joule heating in wood-derived carbon materials for absorption-dominated EMI shielding

Abstract: To cope with sophisticated application scenarios, carbon materials can provide opportunities for integrating multi-functionalities into superior electromagnetic interference (EMI) shielding properties.

Cited by 11 publications

References 60 publications

Absorption‐Dominant Electromagnetic Interference (EMI) Shielding across Multiple mmWave Bands Using Conductive Patterned Magnetic Composite and Double‐Walled Carbon Nanotube Film

Absorption‐Dominant Electromagnetic Interference (EMI) Shielding across Multiple mmWave Bands Using Conductive Patterned Magnetic Composite and Double‐Walled Carbon Nanotube Film

Transparent electromagnetic interference shielding materials using MXene

Nanotechnology in Defense and Social Justice: Opportunities and Risks

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