[1D01-07] Surface Science / Structure (SS3)

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)

[1D05] Local vibrational measurements and plasmon-induced reactions of 2D-MOFs by STM-TERS

*Naoki Hashimoto^1,2, Masaki Horie³, Adnan Hammud², Martin Wolf², Akitoshi Shiotari², Toyo Kazu Yamada¹ (1. Chiba University (Japan), 2. Fritz-Haber Institute (Germany), 3. Hokkaido University (Japan))

Two-dimensional metal–organic frameworks (2D-MOFs) are promising materials for catalysis and quantum spin applications, but their local optical response and stability remain unclear. We studied a quaterphenyl-dicarbonitrile self-assembled monolayer (2D-SAM) on Ag(111) and a Co-coordinated honeycomb 2D-MOF using low-temperature STM and tip-enhanced Raman spectroscopy (TERS). Localized surface plasmons in the Ag tip–substrate nanogap enhanced Raman scattering, enabling local vibrational spectroscopy with ~2 nm resolution. Raman intensities differed among Ag nanopores, Ph₄DN, and Co sites. Optical irradiation caused dissociation, shortening, and disorder in the 2D-SAM, whereas the 2D-MOF largely retained its honeycomb structure because of Co coordination. Such an approach could provide a strategy for tailoring the chemical reactivity, catalytic activity, electronic structure, and spin-related properties of surface-supported 2D materials with nanometer-scale precision.

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