Electrochemically modulated interaction of MXenes with microwaves
Electrochemically modulated interaction of MXenes with microwaves
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DOI：
10.1038/s41565-022-01308-9
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发表时间：
2023-01-16
影响因子：
38.3
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Han, Meikang;Zhang, Danzhen;Gogotsi, Yury
利用各种MXene的电化学行为来调制薄膜与微波的相互作用。电磁波干扰的动态控制是保护工作在千兆赫频率的电子设备的一个显著技术挑战。泡沫材料可以调节微波的反射和吸收，从而实现可调的电磁干扰屏蔽能力，但其几毫米的厚度阻碍了其在集成电子产品中的应用。在这里，我们展示了一种使用各种亚微米厚的MXene薄膜调制入射电磁波的反射和吸收的方法。电磁干扰屏蔽效果的可逆可调谐性通过电化学驱动的离子嵌入和脱嵌来实现;这导致不同电解质的电荷转移效率，伴随着MXene层间距的膨胀和收缩。最后，我们展示了一个不可逆的电磁干扰屏蔽报警器，通过电化学氧化MXene薄膜。与静态电磁干扰屏蔽相比，我们的方法提供了实现有源调制的机会，可以适应苛刻的环境。
Modulating the interaction of a thin film with microwaves is realized using the electrochemical behaviours of various MXenes.Dynamic control of electromagnetic wave jamming is a notable technological challenge for protecting electronic devices working at gigahertz frequencies. Foam materials can adjust the reflection and absorption of microwaves, enabling a tunable electromagnetic interference shielding capability, but their thickness of several millimetres hinders their application in integrated electronics. Here we show a method for modulating the reflection and absorption of incident electromagnetic waves using various submicrometre-thick MXene thin films. The reversible tunability of electromagnetic interference shielding effectiveness is realized by electrochemically driven ion intercalation and de-intercalation; this results in charge transfer efficiency with different electrolytes, accompanied by expansion and shrinkage of the MXene layer spacing. We finally demonstrate an irreversible electromagnetic interference shielding alertor through electrochemical oxidation of MXene films. In contrast with static electromagnetic interference shielding, our method offers opportunities to achieve active modulation that can adapt to demanding environments.