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Mechanism of dc conduction in polyaniline doped with sulfuric acid
Institution:1. National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi 110012, India;2. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India;1. College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, Jiangsu, People''s Republic of China;2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing 211100, Jiangsu, People''s Republic of China;3. Research Institute of Aerospace Special Materials & Technology, Beijing 100074, People''s Republic of China;4. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People''s Republic of China;1. Beijing National Laboratory for Molecular Sciences, Organic Solids Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. Graduate School of Chinese Academy of Sciences, Beijing 100049, PR China;1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan 430062, People’s Republic of China;2. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China;1. Magnetics and Advanced Ceramics Laboratory, Physics Department, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;2. Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, P.O.B. 49, H-1525 Budapest, Hungary;3. National University of Science and Technology MISiS, Moscow 119049, Russia;4. ITMO University, St. Petersburg 197101, Russia;1. Department of Materials Science and Engineering, University of Ioannina, Ioannina 45110, Greece;2. Department of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
Abstract:A temperature variation of dc conductivity in the range 77–300 K has been carried out in order to explore the mechanism of charge transport in polyaniline (PAN) doped with sulfuric acid. The variable range hopping (VRH) exponent changes as the transition of the PAN lattice takes place in a narrow pH range thereby indicating that the charge transport is crucially composition dependent. A decrease in activation energy has been observed as the doping level is increased. Spin concentration of charge carriers determined by electron spin resonance spectroscopy has also been found to depend on the doping level of the specimen. Polarons and bipolarons formed during the doping process are the charge carriers in this system. The temperature dependence of dc conductivity and activation energy data are indicative of existence of both VRH and mixed conduction for various doping levels in these samples.
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