Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Electrical, Dielectrical and Optical Properties of Thin Films

CPP 22.3: Talk

Monday, March 16, 2020, 15:30–15:45, ZEU 114

Ultrathin electrically conductive films created from different polycations and oxidized carbon nanotubes for bioelectrical applications — •Sven Neuber, Peter Nestler, Annekatrin Sill, Heiko Ahrens, and Christiane A. Helm — Institute of Physics, University of Greifswald, 17489 Greifswald, Germany

Surface functionalization by ultrathin films is becoming increasingly important for technological and biological applications such as the electrically active implants. nm-thick films were made by sequential adsorption of different polycations (strong polycation PDADMA; weak polycations PAH and branched PEI) and oxidized carbon nanotubes (CNT). The degree of oxidation of CNTs was determined by XPS and UV-vis absorption spectroscopy. Quartz crystal microbalance and ellipsometry have shown that film structure depends on the used polycation. Films from strong polycation PDADMA/CNT (9 layer CNTs) are more compact, thinner (d = 33.88 nm), less rough (Rq = 13.87 nm) and more electrical conductive (σ = 60.6 mΩ-1m-1) compared to films from weak polycations like PEI/CNT (9 layer CNTs, d = 42.5nm, Rq = 20.25 nm, σ = 16.4 mΩ-1m-1). AFM images show that the films have a network structure with random nanopores, making them ideal structures for biomedical applications.