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O: Fachverband Oberflächenphysik
O 120: Focus Session: Nonequilibrium Electron Transfer Across Interfaces in Real Time
O 120.4: Vortrag
Freitag, 20. März 2020, 11:45–12:00, TRE Ma
New spectroscopical tools for single-molecule junctions — •Albert Aragonès1, Ismael Díez-Pérez2, and Katrin Domke1 — 1Max Planck Institute for Polymer Research, Mainz, Germany — 2Department of Chemistry, Faculty of Natural & Mathematical Sciences, London, UK
Biological charge transport (CT) is the key step in many basic cellular processes such as respiration or photosynthesis and nature has developed highly specialized molecular building blocks to achieve it with unprecedented efficiency. Understanding the mechanisms behind biological CT is key to elucidate the changes in its regimes caused by specific structural variations of the associated molecular machinery. Such knowledge will ultimately lead us to tailor its electrical properties and exploit them as high performance bioelectronic devices with a wide variety of applications in organic electronics, sensing, biomanufacturing etc.
To investigate CT in single-molecule bioelectronic devices, we exploit Scanning Tunnelling Microscopy-based approaches in the break-junction mode (STM-BJ) under electrochemical control (EC-STM). It allows the trapping of individual molecules in a junction to characterize their main electrical signatures. This contribution will present novel light-induced tunneling transport studies carried out with Azurines molecules (blue copper proteins) under electrochemical control. Evident effects over the electron transport mechanism have been demonstrated due employing laser illumination in resonance with the "Ligand-to-Metal Charge Transfer" transition of the Azurine.