| AVS 64th International Symposium & Exhibition | |
| 2D Materials Focus Topic | Wednesday Sessions |
| Session 2D+EM+SS+TF-WeM |
| Session: | 2D Materials Growth and Fabrication |
| Presenter: | Christof Neumann, Friedrich Schiller University Jena, Germany |
| Authors: | C. Neumann, Friedrich Schiller University Jena, Germany M. Füser, Goethe University Frankfurt, Germany M. Mohn, Ulm University, Germany D. Kaiser, Friedrich Schiller University Jena, Germany A. Gölzhäuser, Bielefeld University, Germany U. Kaiser, Ulm University, Germany A. Terfort, Goethe University Frankfurt, Germany A. Turchanin, Friedrich Schiller University Jena, Germany |
| Correspondent: | Click to Email |
The potential of atomically thin materials like graphene or carbon nanomembranes (CNMs) [1] for separation or ultrafiltration technologies is based on their negligible thicknesses enabling the ballistic transport of atoms and molecules through the nanomembranes. For such implementations, large scale production of perforated nanomembranes with well-defined sizes of nanopores has to be established. Here we present a scalable method to produce atomically thin graphene nanomembranes with tunable porosity using aromatic self-assembled monolayers (SAMs) as molecular precursors. We employ N-containing 4-(1H-pyrrol-1-yl)thiophenol, 4-(2,5-dimethyl-1H-pyrrol-1-yl)thiophenol and 4-(pyrimidin-2-yl)phenylthiol SAMs on polycrystalline copper foils to convert them into CNMs via low energy electron irradiation induced crosslinking and then to pyrolyze CNMs into nanoporous graphene sheets in vacuum. We characterize the formed supported and suspended graphene nanosheets by different complementary spectroscopy and microscopy techniques including X-ray photoelectron (XPS) and Raman spectroscopy, atomic force (AFM), helium ion (HIM) and high-resolution transmission electron microscopy (HRTEM) as well as by electric transport measurements. We demonstrate that the pore size and the graphene crystallinity can be adjusted by the production parameters and discuss the mechanisms.
[1] A. Turchanin and A. Gölzhäuser, Carbon Nanomembranes, Adv. Mater. 28 (2016) 5075