Small｜Gelification-assisted assembly of high-strength and high-performance self-supporting MXene films for electromagnetic shielding

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Research abstract

Benefiting from high electronic conductivity and unique layered microstructure, layered MXene films show great potential in many fields. However, the intrinsic oxidative nature and mechanical fragility of MXene films have become two major bottlenecks preventing their widespread application. In view of this, the research team of Professor Dong Yang of Fudan University published the latest research results in "Small", and proposed a simple and effective assembly strategy to solve the above problems by enhancing the arrangement and tightness of the MXene layers to enhance the interaction between the layers. . This method includes a multifunctional inorganic polymer (ammonium polyphosphate, APP)-assisted gelation process of MXene sheets, followed by a quasi-solid-state assembly by mechanical rolling, so that a 3D gel network can be realized The transition to 2D self-supporting MXene films. In addition, the obtained MXene-APP film (MAF) simultaneously exhibited high mechanical strength (286.4 ± 20.3 MPa) and excellent electronic conductivity (8012.4 ± 325.6 S cm-1), and also has good environmental stability. In electromagnetic shielding applications, MAFs exhibit outstanding electromagnetic shielding efficiency and long lifetime, illustrating the great potential of gel-assisted assembly strategies for large-area, high-performance MXene films for practical use.

Graphical guide





Figure 1. Schematic diagram of the gel-assisted assembly strategy of MAF and the corresponding SEM image, (002) peak orientation scan image and XRD spectrum.





Figure 2. STEM image of IMAF-0.25 and corresponding EDS element mapping distribution; FTIR of APP, PMF and MAF-0.25; high-resolution Ti 2pXPS spectrum; solid-state NMR and thermogravimetric curves.





Figure 3. Physical map, tensile, Youngs modulus, conductivity and performance comparison of MAF-0.25.





Fig. 4. SEM images of PMF and MAF-1 after storage for two weeks at room temperature; electronic conductivity of PMF and MAF-0.25 as a function of storage time; atomic ratio of Ti in different samples; PMF and MAF after storage for 70 days -0.25 SEM image.





Figure 5. Schematic diagram of the electromagnetic shielding mechanism of MAF, and the comparison of the corresponding key parameters.



Summarize

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The MXene film materials prepared in this paper have a synergistic enhancement mechanism at the molecular level, which enables the MXene film to simultaneously possess outstanding mechanical strength and high electronic conductivity. The existence of APP makes the MXene film have outstanding environmental stability and flame retardancy. It also exhibits excellent performance in electromagnetic shielding applications.



Literature link

https://doi.org/10.1002/smll.202200829

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2022

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