Electromagnetic Shields Based on MXene Nano-Metamaterials

基于 MXene 纳米超材料的电磁屏蔽

• 批准号: 2034114
• 负责人: Gennady Friedman
• 金额: $ 49万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2034114&HistoricalAwards=false
• 关键词: Electromagnetic; Shields; Based; MXene; Nano

All modern electronics uses electromagnetic shields to cut down on electrical interferences that can completely destroy information stored and passed by the electronic components. This is particularly important in military applications, medical electronics and consumer wireless systems including wearable devices and 5G cell phones. The present day electromagnetic shielding technology is challenged to keep up with the need for being lighter and smaller. Conventional metal shields commonly used today are bulky and lack mechanical flexibility. The proposed work focuses on developing new highly effective electromagnetic shields of dramatically reduced weight and size. They will be thinner than sheets of paper and completely flexible. This new technology is based on the recently discovered new class of materials called MXenes. The proposal will develop MXene electromagnetic shields that can be laid over flexible electronics and even spray painted over it. We will learn how to optimize shielding behavior of these novel materials and develop software and models to help creators of modern electronics to design the most effective electromagnetic shields.While previous work demonstrated that MXene layers thinner than typical copper shields are capable of shielding electromagnetic fields in the RF and microwave region just as well, there has been no clear explanation for the reasons behind such outstanding performance. Yet, understanding is critical to developing thinner, lighter and more flexible shielding devices. Preliminary measurements indicate that MXene, despite having conductivity lower than copper, has an anomalously high effective dielectric constant. This seems to result in the material characteristic impedance low enough to explain MXene’s great shielding performance. It is known that high dielectric constant can be obtained in artificially created conducting structures known as meta-materials. We conjecture that MXene has certain micro-structural features that, although somewhat random, result in meta-material-like behavior. To develop a much better understanding of this behavior and to design more effective shields, the proposed work will combine analytical and numerical electromagnetic modeling and simulations with fabrication of MXene shielding devices and their experimental testing. Modeling and simulation work will focus on quasi-periodic micro-structure of MXenes in order to determine the circumstances under which these materials would have high effective dielectric constant combined with high effective conductivity. Candidate MXene structures most likely to yield best shields will be fabricated into sheets and filler epoxy-based shields and tested using waveguides and near-field measurements. Modeling and simulation results will be compared with the experimental measurements for model validation.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

所有现代电子产品都使用电磁屏蔽来减少可能完全破坏电子元件存储和传递的信息的电气干扰。这在军事应用、医疗电子和消费无线系统（包括可穿戴设备和5G手机）中尤为重要。当今的电磁屏蔽技术面临着挑战，以满足更轻和更小的需求。目前常用的传统金属屏蔽体体积庞大，缺乏机械柔性。拟议的工作重点是开发新的高度有效的电磁屏蔽显着减少重量和尺寸。它们将比纸张更薄，并且完全灵活。这项新技术基于最近发现的称为MXenes的新材料。该提案将开发MXene电磁屏蔽，可以覆盖在柔性电子产品上，甚至可以在其上喷涂。我们将学习如何优化这些新型材料的屏蔽行为，并开发软件和模型，以帮助现代电子产品的创造者设计最有效的电磁屏蔽。虽然以前的工作表明，MXene层比典型的铜屏蔽层更薄，但它能够屏蔽电磁场。射频和微波领域也一样，一直没有明确的解释背后的原因，这样出色的表现。然而，理解对于开发更薄、更轻和更灵活的屏蔽设备至关重要。初步测量表明，尽管MXene的电导率低于铜，但其有效介电常数非常高。这似乎导致材料的特性阻抗足够低，以解释MXene的出色屏蔽性能。已知的是，可以在被称为超材料的人工创建的导电结构中获得高介电常数。我们推测MXene具有某些微观结构特征，尽管有些随机，但会导致类似超材料的行为。为了更好地理解这种行为并设计更有效的屏蔽，拟议的工作将结合联合收割机分析和数值电磁建模和模拟MXene屏蔽设备的制造及其实验测试。建模和模拟工作将集中在MXene的准周期性微观结构上，以确定这些材料具有高有效介电常数和高有效电导率的情况。最有可能产生最佳屏蔽的候选MXene结构将被制造成片材和填料环氧基屏蔽，并使用波导和近场测量进行测试。建模和仿真结果将与实验测量进行比较，以进行模型验证。该奖项反映了NSF的法定使命，并且通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Directed High-Energy Radio Wave Exposure Detection

定向高能无线电波暴露检测

• DOI: 10.1109/usnc-ursi52151.2023.10237524
• 发表时间: 2023
• 期刊: 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI
• 作者: Tajin, Md Abu;Helali, Zyad;Dandekar, Kapil R.
• 通讯作者: Dandekar, Kapil R.

Electrochemically modulated interaction of MXenes with microwaves

• DOI: 10.1038/s41565-022-01308-9
• 发表时间: 2023-01-16
• 期刊: NATURE NANOTECHNOLOGY
• 影响因子: 38.3
• 作者: Han, Meikang;Zhang, Danzhen;Gogotsi, Yury
• 通讯作者: Gogotsi, Yury

Perspectives for electromagnetic radiation protection with MXenes

• DOI: 10.1016/j.carbon.2022.12.036
• 发表时间: 2022-12-20
• 期刊: CARBON
• 影响因子: 10.9
• 作者: Han, Meikang;Gogotsi, Yury
• 通讯作者: Gogotsi, Yury

Versatility of infrared properties of MXenes

• DOI: 10.1016/j.mattod.2023.02.024
• 发表时间: 2023-05-16
• 期刊: MATERIALS TODAY
• 影响因子: 24.2
• 作者: Han, Meikang;Zhang, Danzhen;Gogotsi, Yury
• 通讯作者: Gogotsi, Yury

Anomalous Radio Frequency Conductivity and Sheet Resistance of 2D Ti 3 C 2 T x MXene

2D Ti 3 C 2 T x MXene 的反常射频电导率和薄层电阻

• DOI: 10.1109/access.2022.3154038
• 发表时间: 2022
• 期刊: IEEE Access
• 影响因子: 3.9
• 作者: Tajin, Md. Abu Saleh;Dandekar, Kapil R.
• 通讯作者: Dandekar, Kapil R.