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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 53: Responsive and Adaptive Systems II
CPP 53.4: Vortrag
Freitag, 22. März 2024, 12:30–12:45, H 0107
Electroactive nanoporous silicon-polypyrrole hybrids in aqueous electrolytes: An in-situ high-resolution X-ray diffraction study — •Manuel Brinker1,2 and Patrick Huber1,2,3 — 1Institut für Material- und Röntgenphysik, Technische Universität Hamburg, Denickestraße 15, 21073 Hamburg, Deutschland — 2Deutsches Elektronen-Synchrotron DESY, Center for X-Ray and Nano Science CXNS, 22607 Hamburg, Deutschland — 3Center for Hybrid Nanostructures CHyN, Universität Hamburg, 22607 Hamburg, Deutschland
A hybrid material of the electroactive polymer polypyrrole filled within the scaffold structure of the porous semiconductor porous silicon is exhibiting a reversible straining by control of an applied potential in an electrolyte solution. Anions from the electrolyte solution are inserted into or extracted from the polymer if it is polarized by an applied potential. This process is accompanied by an expansion or contraction of the polymer, which means a change of its geometrical dimensions. This process is directed by the confinement of the silicon nanopores. The swelling of the polymer impacts the mono-crystalline lattice in the porous silicon pore walls. Thus, it is possible to perform a highly resolved investigation of the reversible straining by means of an in-situ X-ray diffraction study that determines the lattice parameter inside the pore wall. [1]
[1] Manuel Brinker, Marc Thelen, Manfred May, Dagmar Rings, Tobias Krekeler, Pirmin Lakner, Thomas F. Keller, Florian Bertram, Norbert Huber, and Patrick Huber(2022). Physical Review Materials, 6(11), 116002.
Keywords: Polypyrrole; Porous silicon; X-ray diffraction; Electroactive polymer