材料科学
范德瓦尔斯力
电磁屏蔽
电磁干扰
复合材料
电磁干扰
柔性电子器件
纳米技术
光电子学
电气工程
化学
分子
工程类
有机化学
作者
Fuquan Deng,Jianhong Wei,Yadong Xu,Zhiqiang Lin,Xi Lü,Yan‐Jun Wan,Rong Sun,Ching‐Ping Wong,Yougen Hu
标识
DOI:10.1007/s40820-023-01061-1
摘要
Abstract Low-dimensional transition metal dichalcogenides (TMDs) have unique electronic structure, vibration modes, and physicochemical properties, making them suitable for fundamental studies and cutting-edge applications such as silicon electronics, optoelectronics, and bioelectronics. However, the brittleness, low toughness, and poor mechanical and electrical stabilities of TMD-based films limit their application. Herein, a TaS 2 freestanding film with ultralow void ratio of 6.01% is restacked under the effect of bond-free van der Waals (vdW) interactions within the staggered 2H-TaS 2 nanosheets. The restacked films demonstrated an exceptionally high electrical conductivity of 2,666 S cm −1 , electromagnetic interference shielding effectiveness (EMI SE) of 41.8 dB, and absolute EMI SE (SSE/t) of 27,859 dB cm 2 g −1 , which is the highest value reported for TMD-based materials. The bond-free vdW interactions between the adjacent 2H-TaS 2 nanosheets provide a natural interfacial strain relaxation, achieving excellent flexibility without rupture after 1,000 bends. In addition, the TaS 2 nanosheets are further combined with the polymer fibers of bacterial cellulose and aramid nanofibers via electrostatic interactions to significantly enhance the tensile strength and flexibility of the films while maintaining their high electrical conductivity and EMI SE.This work provides promising alternatives for conventional materials used in EMI shielding and nanodevices.
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