Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Scanning probe microscopy: light matter interaction at atomic scales – Poster
O 43.2: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Sub-nanoscale photochemistry without plasmons: Debromination of dibromoterphenyl on Au(111) — Hao Jiang1,2, Youngwook Park1, Adnan Hammud1, Martin Wolf1, Qiang Sun2, and •Akitoshi Shiotari1 — 1Fritz Haber Institute of the Max Plank Society, Berlin, Germany — 2Materials Genome Institute, Shanghai University, Shanghai, China
Local control of light-induced reactions is a crucial process for developing molecule-based optodevices and designing photocatalysis. Nanometer- and angstrom-scale photoreaction controls have been demonstrated using scanning tunneling microscopy (STM) combined with laser irradiation [1,2]; however, so far they rely on localized surface plasmon resonance (LSPR) using plasmonic metal tips. Here we report a novel light-assisted reaction that can be induced locally without LSPR. Using laser-coupled low-temperature STM, we observed 4,4''-dibromo-p-terphenyl (DBTP) on Au(111), which is a representative system undergoing Ullmann coupling by heat or far-field illadiation [3,4]. By tuning both the bias voltage at the STM junction and the wavelength of the incident visible laser, the debromination of DBTP is induced at the sub-nanometer scale using non-plasmonic tips. This research opens up the prospect of performing the single-molecule photochemistry for various non-plasmonic systems.
[1] E. Kazuma et al., Prog. Surf. Sci. 93, 163 (2018). [2] Y. Park et al., Nat. Commun. 15, 6709 (2024). [3] H. Jiang et al., ACS Nano 18, 1118 (2024). [4] H. Jiang et al., Nano Lett. 25, 9597 (2025).
Keywords: scanning tunneling microscopy; on-surface synthesis; single-molecule reaction; debromination; photochemistry