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    Layer-by-layer self-assembly of pillared two-dimensional multilayers

    Year: 2019

    Journal: Nat. Commun., Volume 10, JUN 11

    Authors: Tian, Weiqian; VahidMohammadi, Armin; Wang, Zhen; Ouyang, Liangqi; Beidaghi, Majid; Hamedi, Mahiar M.

    Organizations: European Research Council (ERC)European Research Council (ERC) [715268]; Wallenberg Wood Science Centre at KTH through the Knut and Alice Wallenberg Foundation; Wenner-Gren Foundation; Alabama EPSCoR Graduate Research Scholar Program (GRSP); Auburn University's Inramural Grants Program (IGP)

    We report Layer-by-Layer (LbL) self-assembly of pillared two-dimensional (2D) multilayers, from water, onto a wide range of substrates. This LbL method uses a small molecule, tris(2-aminoethyl) amine (TAEA), and a colloidal dispersion of Ti3C2Tx MXene to LbL self-assemble (MXene/TAEA)(n )multilayers, where n denotes the number of bilayers. Assembly with TAEA results in highly ordered (MXene/TAEA)(n) multilayers where the TAEA expands the interlayer spacing of MXene flakes by only similar to 1 angstrom and reinforces the interconnection between them. The TAEA-pillared MXene multilayers show the highest electronic conductivity of 7.3 x10(4) S m(-1) compared with all reported MXene multilayers fabricated by LbL technique. The (MXene/ TAEA)(n) multilayers could be used as electrodes for flexible all-solid-state supercapacitors delivering a high volumetric capacitance of 583 F cm(-3) and high energy and power densities of 3.0 Wh L-1 and 4400 W L-1, respectively. This strategy enables large-scale fabrication of highly conductive pillared MXene multilayers, and potentially fabrication of other 2D heterostructures.
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