Muschi Mégane, Lalitha Anusha, Sene Saad, Aureau Damien, Fregnaux Mathieu, Esteve Imène, Rivier Lucie, Ramsahye Naseem, Devautour-Vinot Sabine, Sicard Clémence, Menguy Nicolas, Serre Christian, Maurin Guillaume, Steunou Nathalie
Institut des Matériaux Poreux de Paris, UMR 8004 CNRS-ENS-ESPCI, PSL research university, Paris, France.
Institut Charles Gerhardt Montpellier, Univ. Montpellier, CNRS, ENSCM, Montpellier, France.
Angew Chem Int Ed Engl. 2020 Jun 22;59(26):10353-10358. doi: 10.1002/anie.202000795. Epub 2020 Apr 14.
An innovative strategy is proposed to synthesize single-crystal nanowires (NWs) of the Al dicarboxylate MIL-69(Al) MOF by using graphene oxide nanoscrolls as structure-directing agents. MIL-69(Al) NWs with an average diameter of 70±20 nm and lengths up to 2 μm were found to preferentially grow along the [001] crystallographic direction. Advanced characterization methods (electron diffraction, TEM, STEM-HAADF, SEM, XPS) and molecular modeling revealed the mechanism of formation of MIL-69(Al) NWs involving size-confinement and templating effects. The formation of MIL-69(Al) seeds and the self-scroll of GO sheets followed by the anisotropic growth of MIL-69(Al) crystals are mediated by specific GO sheets/MOF interactions. This study delivers an unprecedented approach to control the design of 1D MOF nanostructures and superstructures.
提出了一种创新策略，以氧化石墨烯纳米卷作为结构导向剂来合成二羧酸铝MIL-69(Al)金属有机框架（MOF）的单晶纳米线（NWs）。发现平均直径为70±20 nm且长度可达2 μm的MIL-69(Al) NWs优先沿[001]晶体学方向生长。先进的表征方法（电子衍射、透射电子显微镜、扫描透射电子显微镜-高角度环形暗场成像、扫描电子显微镜、X射线光电子能谱）和分子模拟揭示了MIL-69(Al) NWs的形成机制，涉及尺寸限制和模板效应。MIL-69(Al)晶种的形成以及氧化石墨烯片的自卷曲，随后是MIL-69(Al)晶体的各向异性生长，是由特定的氧化石墨烯片/金属有机框架相互作用介导的。这项研究提供了一种前所未有的方法来控制一维金属有机框架纳米结构和超结构的设计。
