SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster Session III

CPP 8.22: Poster

Mittwoch, 29. September 2021, 17:30–19:30, P

bias- and concentration-dependent switching of supramolecular nanostructures at the solid-liquid interface — •Baoxin Jia1, Mihaela Enache1, Sandra Miguez-Lago2, Milan Kivala2, and Meike Stöhr11Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Institute of Organic Chemistry, University of Heidelberg, Germany

Research into the controlled switching between different molecular phases at the solid-liquid interface induced by an external electric field has gained increasing attention over the past years. Here we discuss the bias- and concentration-dependent switching of a carboxy-functionalized triarylamine derivative at the nonanoic-HOPG interface studied by scanning tunneling microscopy. 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 still observed at positive sample bias. For a 20% saturated solution, the two porous phases and the close-packed phase coexisted at positive sample bias because of the low molecule concentration in the solution, while the two porous phases were observed at negative bias. For all concentrations investigated, by changing the polarity of bias voltage, a reversible phase transformation between the porous phases to the close-packed phase was accomplished. Our study demonstrates that controlled structural changes can be accomplished by changing the polarity of the applied external field.

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