Ultrastrong MXene films via the synergy of intercalating small flakes and interfacial bridging

Sijie Wan, Xiang Li, Ying Chen, Nana Liu, Shijun Wang, Yi Du, Zhiping Xu, Xuliang Deng, Shixue Dou, Lei Jiang and Qunfeng Cheng ()
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Sijie Wan: Beihang University
Xiang Li: Beihang University
Ying Chen: Peking University School and Hospital of Stomatology
Nana Liu: Beihang University
Shijun Wang: National Center for Nanoscience and Technology
Yi Du: Beihang University
Zhiping Xu: Tsinghua University
Xuliang Deng: Peking University School and Hospital of Stomatology
Shixue Dou: University of Wollongong
Lei Jiang: Beihang University
Qunfeng Cheng: Beihang University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Titanium carbide MXene combines high mechanical and electrical properties and low infrared emissivity, making it of interest for flexible electromagnetic interference (EMI) shielding and thermal camouflage film materials. Conventional wisdom holds that large MXene is the preferable building block to assemble high-performance films. However, the voids in the films comprising large MXene degrade their properties. Although traditional crosslinking strategies can diminish the voids, the electron transport between MXene flakes is usually disrupted by the insulating polymer bonding agents, reducing the electrical conductivity. Here we demonstrate a sequential densification strategy to synergistically remove the voids between MXene flakes while strengthening the interlayer electron transport. Small MXene flakes were first intercalated to fill the voids between multilayer large flakes, followed by interfacial bridging of calcium ions and borate ions to eliminate the remaining voids, including those between monolayer flakes. The obtained MXene films are compact and exhibit high tensile strength (739 MPa), Young’s modulus (72.4 GPa), electrical conductivity (10,336 S cm−1), and EMI shielding capacity (71,801 dB cm2 g−1), as well as excellent oxidation resistance and thermal camouflage performance. The presented strategy provides an avenue for the high-performance assembly of other two-dimensional flakes.

Date: 2022
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DOI: 10.1038/s41467-022-35226-0

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