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Optical absorption and vibrational spectroscopy of conducting polypyrrole under pressure
Affiliation:1. Universität Potsdam, Hochdrucklabor, Institut für Physik — Physik kondensierter Materie, Am Neuen Palais 10, 14469 Potsdam, Germany;2. Universität Potsdam, Interdisziplinäres Forschungszentrum für Dünne Organische und Biochemische Schichten, Am Neuen Palais 10, 14469 Potsdam, Germany;3. Department of Physics, Colorado State University, Fort Collins, CO 80523, USA;1. G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA;2. Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran;3. Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran;4. National Cell Bank, Pasture Institute of Iran, Tehran, Iran;5. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran;6. Department of Engineering and Technology, Golestan University, Aliabad Katool, Iran;7. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA;1. School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;2. School of Bioprocess Engineering, Universiti Malaysia Perlis, Kompleks Pusat Pengajian Jejawi 3, Arau 02600, Perlis, Malaysia;3. Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia;1. School of Chemistry and Environmental Science, YiLi Normal University, Yining 835000, China;2. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China;1. Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179, Poznań, Poland;2. Department of Chemistry, University of Bialystok, Ciołkowskiego 1K, 15-245, Białystok, Poland;1. School of Life Science and Technology, MOE Key Laboratory of Micro-systems and Micro-structures Manufacturing, Harbin Institute of Technology, Harbin 150080, PR China;2. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, PR China;3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150080, PR China
Abstract:Polypyrrole in its conducting form was chemically synthesized using p-toluenesulfonic acid as doping agent. UV–Vis absorption and vibrational spectroscopy was used for characterization of the electronic properties. The measurements were conducted under high pressure up to 4 GPa which allows for observation of changes of the structural parameters without changing the chemical nature. The results are interpreted in terms of the stability of charge carriers. A change of the character of the charge carriers from bipolarons to polarons is suggested.
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