Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Solid-Liquid Interfaces 2: Structure and Spectroscopy
O 15.5: Vortrag
Montag, 5. September 2022, 16:15–16:30, S054
bias-dependent switching of molecular nanostructures at the liquid-HOPG interface: the influence of concentration — •Baoxin Jia1, Mihaela Enache1, Sandra Miguez-Lago2, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Institute of Organic Chemistry, University of Heidelberg, Germany
Here we discuss the influence of concentration on the bias-dependent switching of a carboxy-functionalized triarylamine derivative at the nonanoic acid-HOPG interface studied by STM. For a fully saturated solution, a porous phase (chickenwire) was observed for negative sample bias and a close-packed phase for positive sample bias. For a 50% saturated solution, a second porous phase (flower) coexisted with the chickenwire phase at negative sample bias, while the close-packed phase was observed at positive sample bias. For a 20% saturated solution, the two porous phases and the close-packed phase coexisted at positive sample bias, while the two porous phases were observed at negative bias. For all concentrations investigated, a reversible phase transformation between the porous phases and the close-packed phase was accomplished by changing the bias polarity. Additionally, the switching behaviour for a 10:1 mixture of the triarylamine derivatives and 1,3,5-tris(4-carboxyphenyl) benzene molecules at the interface was studied. No intermixed structures were observed. Instead, both molecules formed networks separately but still showed a bias-induced phase transformation. However, the switching occurred for each molecule separately and no effect of cooperativity was detected.