Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 58: Nanostructures, Nanostructuring and Nanosized Soft Matter
CPP 58.10: Vortrag
Donnerstag, 4. April 2019, 17:45–18:00, H13
Nanoporous Gold supported Polypyrrole: Electrochemically Modulated Elasticity — •Jie Li1, Jürgen Markmann1,2, Jörg Weissmüller1,2, and Nadiia Mameka1 — 1Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics — 2Hamburg University of Technology, Institute of Materials Physics and Technology
Polypyrrole (PPy), an intrinsic conducting polymer, has drawn widespread attention in many fields, such as, displays, ion exchange membranes and actuators, where mechanical integrity is required by functionalities. Thin films preparation and their mechanical properties, say, strength, have been widely studied, whereas the elastic modulus, especially the modulus under stress coupled with electrochemical conditions, remains to be clarified. Herein, PPy film is electropolymerized on mm-size nanoporous gold (NPG), a 3D bicountinuous network of nanoscaled ligaments and pores with large surface area [1]. Uniform PPy coatings with various thicknesses in bulk NPG are achieved without blocking the original nanopores. The elastic modulus measurements of NPG-PPy composites were performed in situ during potential cycling in aqueous electrolyte in a dynamic mechanical analyzer (DMA). In situ DMA experiments reveal a non-monotonic modulus response versus the potential during charging-discharging processes, as opposed to nearly linear variation of the macroscopic length. Moreover, the modulus variation amplitude increases with the PPy film thickness. Possible mechanisms for the stiffness behavior will be discussed. [1] Mameka et al, Mater. Res. Lett., 2016, 1:27.