[2D12-21] Surface Science (SS1) Physical Property

4:15 PM - 4:30 PM JST(7:15 AM - 7:30 AM UTC)

[2D18] Robust Nanoporous Two-Dimensional Metal–Organic Frameworks on Cu(111) for Single-Atom Hosting

*Toyo Kazu Yamada¹, Haruki Ishii¹, Kohei Tada², Ryo Ichikawa¹, Ryunosuke Sagehashi³, Fumi Nishino⁴, Keisuke Fukutani³, Rikuya Hirota², Yasutaka Kitagawa², Satoshi Kera³, Masaki Horie⁵ (1. Chiba University (Japan), 2. The University of Osaka (Japan), 3. Institute for Molecular Science (Japan), 4. National Institutes for Quantum Science and Technology (Japan), 5. Hokkaido University (Japan))

Surface-supported two-dimensional metal–organic frameworks (2D-MOFs) provide versatile platforms for engineering emergent electronic and quantum functionalities. Here we report a robust nanoporous 2D-MOF on Cu(111) formed from the cyano-terminated molecule Ph4DN. Unlike analogous MOFs on Ag(111), which require deposited 3d transition-metal coordination linkers, the framework is spontaneously stabilized by intrinsic Cu adatoms without additional metal deposition. Low-temperature scanning tunneling microscopy/spectroscopy (STM/STS), angle-resolved photoemission spectroscopy (ARPES), machine-learning interatomic potential (MLIP) calculations, and density functional theory (DFT) demonstrate that the honeycomb network is energetically stable and forms well-defined ~2 nm nanopores. These nanopores confine Cu(111) surface-state electrons to produce quantum-well states and accommodate isolated Co atoms and precursor molecules without chemical bonding. Our results establish a simple route to robust nanoporous 2D-MOFs for quantum confinement, single-atom architectures, and quantum materials.

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