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O: Fachverband Oberflächenphysik

O 106: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales IV

O 106.7: Vortrag

Freitag, 22. März 2024, 12:15–12:30, MA 041

Fluorescent single-molecule STM probe — •Niklas Friedrich¹, Anna Roslawska², Xabier Arrieta³, Michelangelo Romeo², Eric Le Moal⁴, Fabrice Scheurer², Javier Aizpurua³, Andrei G. Borisov⁴, Tomas Neuman^4,5, and Guillaume Schull² — ¹CIC nanoGune BRTA, Donostia, Spain — ²Université de Strasbourg, CNRS, IPCMS, Strasbourg, France — ³Center for Materials Physics (CSIC-UPV/EHU), DIPC, Donostia, Spain — ⁴Université Paris-Saclay, CNRS, Orsay, France — ⁵Czech Academy of Sciences, Prague, Czech Republic

We present the functionalization of a plasmonic scanning probe tip with a single fluorescent molecule. The functionalization is performed by mechanically attaching an individual PTCDA molecule to the tip’s apex atoms in an upright standing configuration. The electroluminescent character of the singly negatively charged PTCDA⁻ is preserved, despite the molecule’s direct contact with a metal electrode. We characterize the change in luminescence caused by different plasmonic tips, changing cavity geometries and varying bias voltage. Furthermore, we discuss theoretical considerations unraveling the photon emission mechanism.

The presented system showcases the possibility to use single molecules as nanoscale sensors able to retrieve optical properties of samples at the atomic scale.

http://arxiv.org/abs/2311.16805

Keywords: Scanning Tunneling Microscopy Luminescence (STML); nanoscale sensor; single molecule device; molecular electronics