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Proceedings ArticleDOI

Terahertz Wave Shielding and Absorption Materials Based on Organic Aerogels

28 Aug 2022-pp 1-2
TL;DR: In this paper , the authors designed and prepared the terahertz wave shielding and absorption materials based on organic aerogel, which has special advantage of low density and high electromagnetic wave reflection ability.
Abstract: With the development of terahertz technology, there is a booming demand of THz waves shielding and absorption materials to avoid electromagnetic interference or pollution. The electromagnetic interference shielding effectiveness not only depends on their composition, but also is influenced by their microstructures. Porous structure has special advantage of low density and high electromagnetic wave reflection’s ability. We design and prepare the THz wave shielding and absorption materials based on organic aerogel.
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Journal ArticleDOI
TL;DR: In this paper, a highly efficient terahertz wave absorber based on 3D graphene foam (3DG) is first reported, which is obtained owing to faint surface reflection and enormous internal absorption.
Abstract: As a next generation of detection technology, terahertz technology is very promising. In this work, a highly efficient terahertz wave absorber based on 3D graphene foam (3DG) is first reported. Excellent terahertz absorption property at frequency ranging from 0.1 to 1.2 THz is obtained owing to faint surface reflection and enormous internal absorption. By precise control of the constant properties for 3DG, the reflection loss (RL) value of 19 dB is acquired and the qualified frequency bandwidth (with RL value over 10 dB) covers 95% of the entire measured bandwidth at normal incidence, which far surpasses most reported materials. More importantly, the terahertz absorption performance of 3DG enhances obviously with increasing the incidence while majority of materials become invalid at oblique incidence, instead. At the incidence of 45°, the maximum RL value increases 50% from 19 to 28.6 dB and the qualified frequency bandwidth covers 100% of the measured bandwidth. After considering all core indicators involving density, qualified bandwidth, and RL values, the specific average terahertz absorption (SATA) property is investigated. The SATA value of 3DG is over 3000 times higher than those of other materials in open literatures.

211 citations

Journal ArticleDOI
TL;DR: In this paper, the authors showed that the combination of an ultrathin transition metal carbide (MXene) film and a nano-metamaterial shows excellent shielding performance in the microwave regime.
Abstract: DOI: 10.1002/adom.201701076 THz electronics and devices.[12] Recently, nonlinear optical phenomena using high power THz sources[13] and THz plasmonics[14] have been intensively explored. However, electromagnetic interference (EMI) often generated from those THz devices must be shielded in order to protect device and its surroundings.[15] In general, electrically conductive materials, such as carbon and their composites, have been used and shown to have promising EMI shielding capabilities in the range of THz frequencies.[15] Recently, 2D transition metal carbide (MXene) has shown excellent shielding performance in the microwave regime.[16–19] Among all, a thin film of Ti3C2Tx MXenes (≈1.5 μm) can block 99.99% EM waves showing the highest EMI shielding efficiency (EMI SE) for materials of comparable thicknesses.[19] Han et al. reported a composite of Ti3C2Tx in wax which delivers an EMI SE value of 76.1 dB with a thickness of only 1 mm.[18] Qing et al. reported the microwave absorption properties of a Ti3C2Tx filled polymer composite, where a reflection loss value of −11 dB was recorded in Ku band for a 1.4 mm thick sample.[17] Han et al., in another report, developed laminated carbon/TiO2 structures derived from Ti3C2Tx MXenes Terahertz (THz) shielding becomes increasingly important with the growing development of THz electronics and devices. Primarily materials based on carbon nanostructures or polymer–carbon nanocomposites have been explored for this application. Herein, significantly enhanced THz shielding efficiencies for 2D titanium carbide (Ti3C2 MXene) thin films with nanoscale THz metamaterials are presented. Nanoscale slot antenna arrays with strong resonances at certain frequencies enhance THz electromagnetic waves up to three orders of magnitude in transmission, which in turn enormously increases the shielding performance in combination with MXene films. Drop-casting of a colloidal solution of MXene (a few micrograms of dry material) can produce an ultrathin film (several tens of nanometers in thickness) on a slot antenna array. Consequently, THz waves strongly localized in the near-field regime by the slot antenna undergo enhanced absorption through the film with a magnified effective refractive index. Finally, the combination of an ultrathin MXene film and a nano-metamaterial shows excellent shielding performance in the THz range.

131 citations

Journal ArticleDOI
24 Jun 2020
TL;DR: In this paper, the authors used electromagnetic shielding materials generated with the extensive application of electromagnetic wave have been utilized in military radar stealth, electromagnetic shielding of advanced electronic electronic devices have been used in the field of radar stealth.
Abstract: Electromagnetic shielding materials generated with the extensive application of electromagnetic wave have been utilized in military radar stealth, electromagnetic shielding of advanced electronic e...

72 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe the Ti3C2Tx project, which is an extension of the T2T2T project, as follows: "http://www.ti3c2texproject.org/
Abstract: 随着电子设备和无线通讯的迅猛发展,电磁干扰问题也随之日益严重,迫切需要发展高性能的电磁屏蔽防护材料来减轻电磁波干扰危害。MXene(Ti3C2Tx)是一种新型二维材料,具有超高的电导率和活跃的化学活性表面,因而展现出极其优异的电磁屏蔽性能。本文重点介绍了Ti3C2Tx的制备方法、结构特性以及电磁屏蔽机理,客观地综述和评价了近年来国内外关于Ti3C2Tx基薄膜和三维多孔材料在电磁屏蔽应用方面的重要研究进展,并分析了目前存在的主要问题。此外,从Ti3C2Tx的制备、结构调控、设计组装等方面展望了Ti3C2Tx基电磁屏蔽材料的发展方向及趋势,包括发展低成本绿色环保且高效的Ti3C2Tx制备工艺、解决Ti3C2Tx不耐氧化的问题、设计新型Ti3C2Tx电磁屏蔽材料结构及探究其他种类的MXenes电磁屏蔽材料,为开发下一代高电磁屏蔽性能材料提供新的思路和指导。

50 citations

Trending Questions (1)
How electromagnetic wave absorption materials are different from electromagnetic interference shielding materials?

Electromagnetic wave absorption materials are designed to absorb and dissipate electromagnetic waves, while electromagnetic interference shielding materials are designed to reflect or block electromagnetic waves.