The study of electrical and magnetic properties of LiPF6 doped polyaniline |
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| Affiliation: | 1. Department of Physics and Center for Electro and Photo Responsive Molecules, Korea University, Seoul 136-701, South Korea;2. Department of Physics, Korea University, Seoul 136-701, South Korea;3. Electronics and Telecommunications Research Institute, Daejeon 305-350, South Korea;1. Key Laboratory of Photonic and Electric Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China;2. College of Information Science and Engineering, Northeastern University, Shenyang 110819, China;1. Department of Materials Science, Sichuan University, 610064 Chengdu, China;2. Southwest Institute of Technical Physics, Chengdu 610041, China;1. Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. School of Information Science, Xin Hua College of Sun Yat-Sen University, Guangzhou 510520, China;1. Department of Physics, Korea University, Seoul 136-713, Republic of Korea;2. Center for Integrated Nanostructure Physics (CINAP), Institute of Basic Science (IBS), Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea;1. Department of Physics, Korea University, Seoul 136-713, Republic of Korea;2. Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Daejeon 305-701, Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Republic of Korea |
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| Abstract: | The results of temperature dependent dc conductivity, EPR magnetic susceptibility, and X-ray photoelectron spectroscopy experiments (XPS) are reported for polyaniline (PAN) doped with lithium hexafluorophosphate (LiPF6), PAN-LiPF6. DC conductivity (σdc) and its temperature dependence of PAN-LiPF6 samples vary with the average molecular weight (Mw) of polyaniline used and the composition of doping solution. The EPR linewidth and Pauli susceptibility (χP) depend on the Mw of PAN used. The σdc and the χP of the intermediate Mw PAN-LiPF6 samples are higher than those of the low Mw PAN samples, indicating more highly conducting state of the intermediate Mw PAN samples. Based on the results of XPS and EPR experiments, some portions of quinoid rings in emeraldine base form of PAN are transformed into benzenoid rings through LiPF6 doping process, indicating the formation of polarons. However, the existence of some portions of quinoid rings in PAN-LiPF6 samples after doping suggests an inhomogeneous doping or a pseudo doping. |
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