Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Organic Thin Films, Organic-Inorganic Interfaces II (joint session DS/CPP)
DS 17.2: Talk
Tuesday, March 17, 2020, 11:30–11:45, CHE 91
Electrochemical Deposition of Polyelectrolytes — •Felix Plamper1, Sabine Schneider2, and Olga Mergel2 — 1TU Bergakademie Freiberg, Germany — 2RWTH Aachen University, Germany
Charged polymers (polyelectrolytes) interact with oppositely charged counterions. In case of redox-active counterions, their charge can be changed by electrochemical means, allowing a solubility change of these complexes at the electrode (electrochemically-induced film formation). Hence, we address polycations of various architectures made of quaternized poly(dimethylaminoethyl methacrylate) and derivatives to assess their influence on the electrodeposition with help of hexacyanoferrates. A rotating ring disk electrode (RRDE) used during hydrodynamic voltammetry is a powerful method to learn about the interactions of polymers and electroactive species. The RRDE allows a quantification of the deposition efficiency DE. The DE assigns the ratio of charge which was used to produce the deposited electroactive species compared to the total charge. It complements Quartz Crystal Microbalance QCM measurements, which is sensitive to the deposited mass, providing information on the water contents in the films. Different linear polyelectrolytes are investigated and a comparison between other architectures, like star-shaped polymers and microgels, was obtained. The results demonstrate that linear polymers of moderate molar mass are most efficient in the deposition due to pronounced intermolecular physical crosslinking (by help of the hexacyanoferrates), while hydrophilic side groups weaken the deposition by water uptake.