4.8 Article

From MXene Trash to Ultraflexible Composites for Multifunctional Electromagnetic Interference Shielding

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 44, Pages 50120-50128

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c13849

Keywords

composite; electromagnetic interference shielding; functional; waterborne polyurethane; MXene

Funding

  1. National Key R&D Program of China [2021YFB3502500]
  2. Natural Science Foundation of Shandong Province [2022HYYQ-014, ZR2016BM16]
  3. Shandong Key Research and Development Program [2019JZZY010312, 2021ZLGX01]
  4. New 20 Funded Programs for University of Jinan [2021GXRC036]
  5. Shenzhen municipal special fund for guiding local scientific and Technological Development [2021Szvup071]
  6. Qilu Young Scholar Program of Shandong University [31370082163127]

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A new type of ultraflexible composite films based on MXenes is prepared, showing outstanding mechanical strength and electrical conductivity. The composites also demonstrate excellent electrothermal and photothermal performance.
The development of flexible composites based on the transition metal carbides/nitrides (MXenes) is gaining popularity because of MXenes' high application potentials for electromagnetic interference (EMI) shields. Here, we prepare a new type of ultraflexible composite films composed of trashed MXene sediment (MS) and waterborne polyurethane using a simple, facile solution casting approach. In addition to the outstanding mechanical strength and electrical conductivity, an extremely wide-range of MS contents can be achieved for the composites, resulting in EMI shielding effectiveness (SE) that may be controlled over a wide range. The X-band EMI SE of the flexible, low-density composites containing 70 wt % MS reaches 45.3 dB at a thickness of merely 0.51 mm. Moreover, the SE values of more than 34.5 dB in the ultrabroadband gigahertz frequency range including X-band, P-band, K-band, and R-band, are accomplished for the thin composites. Furthermore, the MS/WPU composite films show excellent electrothermal and photothermal performance, demonstrating the multifunctionalities of the MS-based EMI shields. Combined with the cost-efficient, sustainable, and scalable preparation approach, the ultraflexible, multifunctional composites from trashed MXene show great potentials for next-generation electronics. This work also opens a new avenue for the creation of innovative, high-performance, multifunctional flexible composites.

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