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    Spontaneous MXene monolayer assembly at the liquid-air interface

    Year: 2019

    Journal: Nanoscale, Volume 11, 1-May, page 9980–9986

    Authors: Petukhov, D. I.; Chumakov, A. P.; Kan, A. S.; Lebedev, V. A.; Eliseev, Artem A.; Konovalov, O. V.; Eliseev, Andrei A.

    Organizations: Russian Fund for Basic Research project [16-08-00574, 16-29-05285]; M.V. Lomonosov Moscow State University Program of Development

    Here we report on the spontaneous assembly of Ti3C2Tx MXene flakes into monolayer films at the liquid-air interface. According to X-ray reflectivity and grazing incidence X-ray fluorescence both the structure of the layers and assembly kinetics depends on the pH value of the solution. At pH > 4 MXene flakes form a single approximate to 1.5 nm thick layer carrying a negative charge, while in the acidic medium the layer contains coordinated anions with the formation of the Br-aq(-)/Ti3C2Tx/subphase interface. The surface layer compression allows the assembling of MXene flakes into a dense monolayer films with the surface coverage of up to 96% and surface pressure exceeding 40 mN m(-1) in the case of the acidic subphase. The films can readily be transferred onto solid substrates by the conventional Langmuir-Blodgett approach or modified by surfactants to form MXene/surfactant composite films.
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