Molecular embroidering of graphene
Tao Wei, Malte Kohring, Heiko B. Weber, Frank Hauke and Andreas Hirsch
Received Date: 17th April 20
Structured covalent 2D-patterning of graphene with different chemical functionalities constitutes a major challenge in nanotechnology. At the same time, it opens enormous opportunities towards tailoring of physical and chemical properties with limitless combinations of spatially defined surface functionalities. However, such highly integrated carbon based 2D-architectures (“graphene embroidery”) are so far elusive. We report here for the first time a practical realization of molecular graphene embroidery by generating regular multiply functionalized patterns consisting of concentric regions of covalent addend binding. These spatially resolved 2D-hetero-architectures were generated by repetitive electron-beam lithography (EBL)/reduction/covalent-binding sequences starting with (polymethyl methacrylate) PMMA covered graphene deposited on a SiO2/Si substrate. The corresponding functionalization zones carry bromobenzene-, deutero- and chloro-addends. We employed statistical Raman spectroscopy together with scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) for an unambiguous characterization. The exquisitely ordered 2D-nanoarchitectures of these covalently multi-patterned graphene sheets were clearly visualized.
Read in full at ChemRxiv.
This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.