Petukhov D I, Chumakov A P, Kan A S, Lebedev V A, Eliseev Artem A, Konovalov O V, Eliseev Andrei A
Department of Chemistry, Lomonosov Moscow State University, Leninskiye gory 1-3, Moscow, 119991, Russia and Department of Materials Science, Lomonosov Moscow State University, 1-73 Leninskiye gory, Moscow, 119991, Russia.
ESRF - The European Synchrotron. 71, Avenue des Martyrs, 38043 Grenoble, France.
Nanoscale. 2019 May 28;11(20):9980-9986. doi: 10.1039/c9nr00525k. Epub 2019 May 10.
Here we report on the spontaneous assembly of TiCT 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 ∼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/TiCT/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 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.
在此，我们报道了TiCT MXene薄片在液-气界面自发组装成单层膜的情况。根据X射线反射率和掠入射X射线荧光，层的结构和组装动力学均取决于溶液的pH值。在pH > 4时，MXene薄片形成一个约1.5 nm厚的带负电荷的单层，而在酸性介质中，该层含有配位阴离子，形成Br/TiCT/亚相界面。表面层压缩使得MXene薄片组装成致密的单层膜，在酸性亚相的情况下，表面覆盖率高达96%，表面压力超过40 mN/m。这些膜可以通过传统的朗缪尔-布洛杰特方法轻松转移到固体基板上，或用表面活性剂进行改性以形成MXene/表面活性剂复合膜。
