Anomalous absorption of electromagnetic waves by 2D transition metal carbonitride Ti3CNTx (MXene)
Anomalous absorption of electromagnetic waves by 2D transition metal carbonitride Ti3CNTx (MXene)
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DOI：
10.1126/science.aba7977
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发表时间：
2020-07-24
期刊：
影响因子：
56.9
通讯作者：
Koo, Chong Min
中科院分区：
文献类型：
--
作者：
Iqbal, Aamir;Shahzad, Faisal;Koo, Chong Min
需要重量轻、可固化和柔性的电磁干扰（EMI）屏蔽材料来保护电子电路和便携式电信设备，并消除设备和设备组件之间的串扰。在这里，我们表明，二维（2D）过渡金属碳氮化物，Ti3CNTx MXene，具有中等的导电性，提供了更高的屏蔽效果相比，更导电的Ti3C2Tx或相同厚度的金属箔。Ti3 CNTx的这种出色的屏蔽性能是通过热退火实现的，这归因于其分层、超材料状结构中对电磁波的异常高吸收。这些结果为设计先进的EMI屏蔽材料提供了指导，但也强调了探索电磁波与2D材料相互作用背后的基本机制的必要性。
Lightweight, ultrathin, and flexible electromagnetic interference (EMI) shielding materials are needed to protect electronic circuits and portable telecommunication devices and to eliminate cross-talk between devices and device components. Here, we show that a two-dimensional (2D) transition metal carbonitride, Ti3CNTx MXene, with a moderate electrical conductivity, provides a higher shielding effectiveness compared with more conductive Ti3C2Tx or metal foils of the same thickness. This exceptional shielding performance of Ti3CNTx was achieved by thermal annealing and is attributed to an anomalously high absorption of electromagnetic waves in its layered, metamaterial-like structure. These results provide guidance for designing advanced EMI shielding materials but also highlight the need for exploring fundamental mechanisms behind interaction of electromagnetic waves with 2D materials.