Self-Assembly Construction of WS2-rGO Architecture with Green EMI Shielding
Self-Assembly Construction of WS2-rGO Architecture with Green EMI Shielding
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具有绿色 EMI 屏蔽功能的 WS2-rGO 架构的自组装构建
DOI：
10.1021/acsami.9b06509
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发表时间：
2019
影响因子：
9.5
通讯作者：
Cao Mao-Sheng
中科院分区：
文献类型：
--
作者：
Zhang De-Qing;Liu Ting-Ting;Shu Jin-Cheng;Liang Shuang;Wang Xi-Xi;Cheng Jun-Ye;Wang Hao;Cao Mao-Sheng
随着全球电磁污染的增加，精确定制电磁（EM）材料以实现高性能的电磁干扰（EMI）屏蔽是非常必要的。绿色电磁屏蔽材料因其较低的二次反射率而引起的附加环境危害较小，正受到广泛关注。然而，高效率和环保性之间的冲突使得绿色EMI屏蔽仍然具有挑战性。在这项工作中，一个新的策略，把客人变成主机的第一次，并构建了一个独特的WS 2-rGO架构的山状墙成功地实现了高效和绿色EMI屏蔽。在所研究的频率范围（2-18 GHz）内，屏蔽效率（SE）超过20 dB，最大值为32 dB，具有可爱的绿色指数（gs = 1.0）。高效和绿色EMI SE归因于WS 2-rGO架构的多级结构和固有介电性质，包括弛豫和传导的协同作用、界面和空隙之间的多次散射以及等效楔形效应。这些结果表明，WS 2-rGO架构在电磁换能器、微波成像、电磁保护和能量器件中是一个有前途的候选者。
Accurately tailoring electromagnetic (EM) materials for achieving high-performance EM interference (EMI) shielding is significantly imperative with increasing EM pollution worldwide. Green EMI shielding materials are attracting extensive attention because of the less additional environmental hazard caused by the lower secondary reflection. However, the conflict between high efficiency and eco-friendly nature makes green EMI shielding still challenging. In this work, a new strategy of turning a guest into a host is developed for the first time, and a unique WS2–rGO architecture of mountain-like wall is constructed successfully achieving efficient and green EMI shielding. The shielding efficiency (SE) is over 20 dB in the investigated frequency range (2–18 GHz) and the maximum was 32 dB with an endearing green index (gs≈ 1.0). The efficient and green EMI SE is ascribed to the multilevel structure and intrinsic dielectric properties of the WS2–rGO architecture, including the synergy of relaxation and conduction, multi-scattering between the interface and void, and the equivalent wedge effect. These results demonstrate that the WS2–rGO architecture is a promising candidate in EM transducers, microwave imaging, EM protection, and energy devices.