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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Electrical, Dielectrical and Optical Properties of Thin Films

CPP 10.1: Talk

Monday, March 18, 2024, 15:00–15:15, H 0111

Highly Electrically Conductive PEDOT:PSS films via Layer-by-Layer Electrostatic Self-Assembly — •Muhammad Khurram, Sven Neuber, Annekatrin Sill, and Christiane A. Helm — Institute of Physics, University of Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald, Germany

The surface coating of an implant should be an adequate bio-interface and promote cell adhesion and proliferation. To support health, the implant should be able to transport electrical impulses. The Layer-by-Layer (LbL) method - the sequential adsorption of oppositely charged macromolecules or nanoparticles - has proven effective in coating a surface. Polyelectrolytes are poor at conducting charges; therefore, electrically conductive nanoparticles are required. PEDOT:PSS nanoparticles are used. LbL films are built from polyanion PEDOT:PSS and polycation poly-diallyldimethylammonium (PDADMA) by dip coating and a flow cell. The film prepared with flow cell exhibits lower roughness, and constant electrical conductivity (230 kS/m), regardless of the number of PEDOT:PSS bilayers deposited. Films prepared with dip-coating have lower conductivity (26 kS/m), and greater roughness. However, the electrical conductivity is constant (230 kS/m) and independent of the number of deposited PEDOT:PSS/ PDADMA bilayers. The coating exhibits ohmic behavior. By clever choice of the coating method and the number of bilayers, the sheet resistance can be tuned by two orders of magnitude.

Keywords: PEDOT:PSS; Conductive coating; Polyelectrolyte multilayer; Layer-by-Layer coating; Flow cell coating