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Published on: August 16, 2018
Robust Pristine MXene Films with Superhigh Electromagnetic Interference Shielding Effectiveness via Spatially
Zetong Zhuang1, Hongwu Chen1,2, Chun Li1
1Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Laboratory of Flexible Electronics Technology, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
Abstract:
Lightweight, thin electromagnetic interference (EMI) shielding film materials with high shielding effectiveness and good mechanical performance are highly required for flexible and portable electronics. Two-dimensional titanium carbide (Ti3C2T MXene) has a great potential to meet these requirements because of the easy fabrication of ultrathin conductive films via solution processing. However, the production of strong pristine MXene films is still challenged by the presence of voids and wrinkles, as well as inferior flake alignment. In this work, high-performance pristine MXene films are produced by a spatially confined evaporation approach with controlled wet film thickness. When the cast dispersion layer is sufficiently thin, the skin effect is suppressed during evaporation, producing films with improved flake alignment and much fewer structural defects. As a result, the pristine MXene films deliver an ultrahigh tensile strength of 707 MPa and a high modulus of 66 GPa, together with a high electrical conductivity of 16600 S cm-1. The high conductivity and intrinsic laminated structure endow the MXene films with superior EMI shielding performance in X-band (48.4 dB and 1.3 × 105 dB cm-2 g-1 for 1.0 μm thick films), being among the highest values reported.
