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O: Fachverband Oberflächenphysik
O 106: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales IV
O 106.7: Talk
Friday, March 22, 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 Neuman4,5, 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