Electronic and magnetic properties of polypyrrole films depending on their one-dimensional and two-dimensional microstructures |
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| Affiliation: | 1. Brandenburgische Technische Universität Cottbus, Angewandte Physik-Sensorik, Postfach 101344, D-03013 Cottbus, Germany;2. Institut für Festkörper- und Werkstofforschung, Helmholtzstraβe 20, D-01069 Dresden, Germany;3. BASF, D-67056 Ludwigshafen, Germany;4. Universität Tübingen, Institut für Physikalische und Theoretische Chemie, Auf der Morgenstelle 8, D-72076 Tübingen, Germany;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China;1. Institut Charles Gerhardt (ICG), UMR-5253, CNRS, UM, ENSCM, Ingénierie et Architectures Macromoléculaires (IAM), Matériaux Avancés pour la Catalyse et la Santé (MACS), Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France;2. Institut de Chimie Séparative de Marcoule (ICSM), UMR-5257, CEA, CNRS, UM, ENSCM, Centre de Marcoule, BP 17171, 30207 Bagnols sur Cèze Cedex, France;3. Institut Européen des Membranes, UMR-5635, CNRS, ENSCM, UM, CC047, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France;4. Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;5. Quantum Nanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands;6. Università di Messina, ERIC aisbl and CASPE/INSTM, Sect. Industrial Chemistry, V.le F. Stagno D’Alcontres 31, 98166 Messina, Italy;1. Institute of Super Microstructure and Ultrafast Process in Advanced Materials, College of Physics and Electronics, Central South University, 605 South Lushan Road, Changsha 410012, PR China;2. Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha 410012, PR China;3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14534, USA;1. Jožef Stefan Institute, Ljubljana, Slovenia;2. Jožef Stefan International Postgraduate School, Ljubljana, Slovenia;3. Institute of Materials Research, German Aerospace Center, Cologne, Germany |
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| Abstract: | We report on the electronic and magnetic properties of polypyrrole films with a one-dimensional and two-dimensional microstructure. Polypyrrole films as well defined and stable polymers are studied. The aim of this work is an explanation of the macroscopic conductivity based on microscopic and electronic structure. In particular we attribute the high d.c. conductivity, the frequency-independent a.c. conductivity and the weak temperature dependence of the conductivity to the existence of two-dimensional crosslinked areas. We characterize the polypyrrole films by photoelectron spectroscopies (X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS)), by electron paramagnetic resonance (EPR) spectroscopy, and by the frequency- and temperature-dependent conductivity measurements. We compare the results to the corresponding properties of one-dimensional polypyrrole films. The two-dimensional films consist of a graphitic electronic structure in which pyrrole monomers either contribute to the two-dimensional π-system or maintain their monomeric character, as characterized by photoelectron spectroscopies. The EPR data reveal magnetic centers that show a Curie-like susceptibility and a weak Pauli contribution, and the latter does not contribute to the conductivity mechanism. The EPR linewidth is extraordinarily sharp and reversibly reflects the dynamics of the interaction to oxygen. |
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