Research ArticleMATERIALS SCIENCE

Elastic properties of 2D Ti3C2Tx MXene monolayers and bilayers

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Science Advances  15 Jun 2018:
Vol. 4, no. 6, eaat0491
DOI: 10.1126/sciadv.aat0491
  • Fig. 1 Preparation of MXene membranes.

    (A) Structure of a Ti3C2Tx monolayer. Yellow spheres, Ti; black spheres, C; red spheres, O; gray spheres, H. (B) Scheme of the polydimethylsiloxane (PDMS)–assisted transfer of MXene flake on a Si/SiO2 substrate with prefabricated microwells. See text for details. (C) SEM image of a Ti3C2Tx flake covering an array of circular wells in a Si/SiO2 substrate with diameters of 0.82 μm. (D) Noncontact AFM image of Ti3C2Tx membranes. (E and F) Height profiles along the dashed blue (E) and red (F) lines shown in (D).

  • Fig. 2 Elastic response and indentation test results.

    (A) Scheme of nanoindentation of a suspended Ti3C2Tx membrane with an AFM tip. (B) Force-deflection curves of a bilayer Ti3C2Tx flake at different loads. The bottom inset is a detailed view of the same curves showing the center of origin. The top inset shows AFM image of the fractured membrane. (C) Comparison of loading curves for monolayer (1L) and bilayer (2L) Ti3C2Tx membranes and the least squares fit to the experimental indentation curves by Eq. 1. Hole diameter is 820 nm. The inset shows the same experimental curve for bilayer Ti3C2Tx in logarithmic coordinates. The curve shows a linear behavior in the first 10 nm of indentation (blue line) and approaches the cubic behavior at high loads (red line). (D) Histogram of elastic stiffness for monolayer and bilayer membranes. Solid lines represent Gaussian fits to the data. (E) Histogram of pretensions of monolayer membranes. (F) Histogram and Gaussian distribution of breaking forces for monolayer membranes. Tip radius is 7 nm.

  • Fig. 3 Comparison of indentation tests on Ti3C2Tx with other 2D materials.

    (A) Comparison of experimental F-δ curves for monolayer graphene and Ti3C2Tx membranes. (B) Comparison of effective Young’s moduli for several 2D materials: GO (12), rGO (13), MoS2 (5), h-BN (8), and graphene (1). In this chart, we compare values produced on membranes of monolayer 2D materials in similar nanoindentation experiments.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/4/6/eaat0491/DC1

    fig. S1. Ti3C2Tx MXene membranes prepared by drop-casting from an aqueous solution.

    fig. S2. Mechanical properties of Ti3C2Tx MXene monolayer on a single flake.

    fig. S3. Mechanical properties of graphene monolayers.

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Ti3C2Tx MXene membranes prepared by drop-casting from an aqueous solution.
    • fig. S2. Mechanical properties of Ti3C2Tx MXene monolayer on a single flake.
    • fig. S3. Mechanical properties of graphene monolayers.

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