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, Ti₃CNT_x MXene, with a moderate electrical conductivity, provides a higher shielding effectiveness compared with more conductive Ti₃C₂T_x or metal foils of the same thickness. This exceptional shielding performance of Ti₃CNT_x 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.

需要轻质，超薄和灵活的电磁干扰（EMI）屏蔽材料来保护电子电路和便携式电信设备，并消除设备与设备组件之间的串扰。在这里，我们表明，具有中等导电性的二维（2D）过渡金属碳氮化物Ti ₃ CNT _x MXene与更具导电性的Ti ₃ C ₂ T _x或相同厚度的金属箔相比，具有更高的屏蔽效果。。Ti ₃ CNT _x的出色屏蔽性能这是通过热退火实现的，这归因于其分层的超材料状结构中异常高的电磁波吸收率。这些结果为设计高级EMI屏蔽材料提供了指导，同时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需要。