Enhanced Terahertz Shielding of MXenes with Nano-Metamaterials
Enhanced Terahertz Shielding of MXenes with Nano-Metamaterials
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DOI：
10.1002/adom.201701076
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发表时间：
2018-03-05
影响因子：
9
通讯作者：
Seo, Minah
中科院分区：
文献类型：
--
作者：
Choi, Geunchang;Shahzad, Faisal;Seo, Minah
随着太赫兹电子和设备的不断发展，太赫兹（THz）屏蔽变得越来越重要。基于碳纳米结构或聚合物-碳纳米复合材料的优先材料已经被探索用于该应用。在此，提出了具有纳米级THz超材料的2D碳化钛（Ti 3C 2 MXene）薄膜的显著增强的THz屏蔽效率。在某些频率下具有强共振的纳米级缝隙天线阵列将THz电磁波的传输增强了三个数量级，这反过来又极大地提高了与MXene薄膜相结合的屏蔽性能。MXene的胶体溶液（几微克的干燥材料）的滴铸可以在缝隙天线阵列上产生一层厚达几十纳米的薄膜。因此，太赫兹波强烈本地化的近场制度的缝隙天线进行增强的吸收，通过薄膜具有放大的有效折射率。最后，一个AMMXene薄膜和纳米超材料的组合显示出优异的屏蔽性能在太赫兹范围内。
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.