1064-nanometer-excited Fourier transform Raman spectroscopy of conducting polymers |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea;2. Research Center for Aircraft Core Technology, Gyeongsang National University, Jinju, Gyeongnam 52828, Republic of Korea;1. ITMO University, Birzhevaya line 4, 199034 Saint-Petersburg, Russia;2. Saint-Petersburg Electrotechnical University “LETI”, Prof. Popova str. 5, 197376 Saint-Petersburg, Russia;1. Department of Chemistry, Faculty of Science, Aligarh Muslim University, Aligarh, 202002, Uttar Pradesh, India;2. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia;1. Department of Physics, Chungnam National University, 99 Daehak-ro Yuseong-gu, Daejeon 34134, Republic of Korea;2. Photonic/Wireless Devices Research Division, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea;3. Beckman Laser Institute, UC Irvine, Irvine, CA 92612, USA;4. Instituted of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro Yuseong-gu, Daejeon, 34134, Republic of Korea |
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| Abstract: | Application of 1064-nm-excited Fourier transform (FT)-Raman spectroscopy to the characterization of conducting polymers is described. 1064-nm-excited FT-Raman spectra with high signal-to-noise ratios are obtained from polyacetylene (PA), poly(1,4-phenylene) (PPP), poly(1,4-phenylene vinylene) (PPV) and poly(2,5-thienylene vinylene) (PTV) in their neutral (insulating) state. The resonant Raman spectra of acceptor- or donor-doped (conducting) PA and PPV are also obtained wih 1064-nm excitation. The resonant Raman spectra of Na-doped PA change in two stages with increasing dopant concentration, the first change corresponding to the increase in electrical conductivity and the second to the appearance of a Pauli susceptibility. The 1064-nm-excited FT-Raman spectrum of Na-doped PPV indicates existence of negative bipolarons which are equivalent to divalent anions extending over a few repeating units in the polymer chains. |
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