Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.53: Poster
Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A
Polypyrrole Nanowires Grown from Polyelectrolyte Single Molecules — •Vera Bocharova1, Anton Kiriy1, Hartmut Vinzelberg2, Ingolf Moench2, and Manfred Stamm1 — 1Leibniz Institute of Polymer Research Dresden, Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research, Dresden, Germany
Low-dimensional nanostructures of conductive polymers have attracted a great interest as building blocks for future miniatuarized nanoelectronic devices and highly sensitive chemical or biological sensors. We have developed a template method to grow continuous highly conductive polypyrrole (Ppy) nanovires (NWs) of variable diameter by polymerization of pyrrole from individual adsorbed polystyrene sulfonic acid (PSA) molecules. [Bocharova, V. Kiriy, A.; Vinzelberg, H.; Mönch, I.; Stamm, M. Angew. Chem. 2005, 117, 6549] The DC conductivity of individual Ppy NWs is not linearly dependent on their diameter. It is likely due to of granular structure of the NWs and a percolation-like conductivity reflecting a transition from the 1D to 2D and then to 3D-percolation networks of grains resulting into increase of the conductivity up to typical Ppy bulk conductivity. We found that the conductivity decreases with decreasing of temperature, as typical for semiconductors. The conductivity can be described using variable-range hopping model. According to this model the transition from 2D to 3D-percolation network of spherical grains was found.