Jeon Intak, Peeks Martin D, Savagatrup Suchol, Zeininger Lukas, Chang Sehoon, Thomas Gawain, Wang Wei, Swager Timothy M
Department of Chemistry, Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Adv Mater. 2019 May;31(21):e1900438. doi: 10.1002/adma.201900438. Epub 2019 Apr 10.
Orthogonal functionalization of 2D materials by selective assembly at interfaces provides opportunities to create new materials with transformative properties. Challenges remain in realizing controllable, scalable surface-selective, and orthogonal functionalization. Herein, dynamic covalent assembly is reported that directs the functionalization of graphene surfaces at liquid-liquid interfaces. This process allows facile addition and segregation of chemical functionalities to impart Janus characteristics to graphenes. Specifically, dynamic covalent functionalization is accomplished via Meisenheimer complexes produced by reactions of primary amines with pendant dinitroaromatics attached to graphenes. Janus graphenes are demonstrated to be powerful surfactants that organize at water/organic, water/fluorocarbon, and organic/fluorocarbon liquid interfaces. This approach provides general access to the creation of diverse surfactant materials and promising building blocks for 2D materials.
通过界面处的选择性组装对二维材料进行正交功能化，为创造具有变革性特性的新材料提供了机会。在实现可控、可扩展的表面选择性和正交功能化方面仍然存在挑战。在此，报道了一种动态共价组装方法，该方法可引导石墨烯表面在液-液界面处进行功能化。此过程允许化学官能团轻松添加和分离，从而赋予石墨烯两面神特性。具体而言，动态共价功能化是通过伯胺与连接在石墨烯上的侧链二硝基芳烃反应生成的迈森海默络合物来实现的。两面神石墨烯被证明是强大的表面活性剂，可在水/有机、水/氟碳和有机/氟碳液体界面处聚集。这种方法为创建各种表面活性剂材料以及二维材料的有前景的构建块提供了通用途径。
