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Chemical synthesis and charge transport mechanism in solution processed flexible polypyrrole films
Affiliation:1. Department of Physics, Indus International University Una, Himachal Pradesh 174301, India;2. Department of Physics, National Institute of Technology Hamirpur, Himachal Pradesh 177005, India;1. National Institute for Research and Development in Electrochemistry and Condensed Matter, Condensed Matter Department, P. Andronescu no. 1, Timisoara 300254, Romania;2. West University of Timisoara, Vasile Parvan 4, 300223 Timisoara, Romania;3. Institute of Chemistry Timisoara of Romanian Academy, Bvd. Mihai Viteazul no. 24, 300223, Romania;1. Basic Science Department, High Institute of Engineering and Technology, El-Arish, North Sinai, Egypt;2. Department of Physics, Faculty of Science at New Damietta, Damietta University, 34517 New Damietta, Egypt;3. Solid State Electronics Laboratory, Solid State Physics Department, Physics Division, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt;1. Department of Physics, Arab-American University, Jenin, West Bank, Palestine;2. Group of Physics, Faculty of Engineering, Atilim University, 06836 Ankara, Turkey;3. Physics Department, Sciences Faculty for Girls, King Abdulaziz University, Jeddah, Saudi Arabia;4. Department of Physics, Middle East Technical University, 06800 Ankara, Turkey;5. Virtual International Scientific Research Centre, Baku State University, 1148 Baku, Azerbaijan;1. Lesya Ukrainka Eastern European National University, 43025 Lutsk, Ukraine;2. Semiconductor Physics Department and Institute of Applied Research, Vilnius University, Saul?tekio al. 9, bldg.3, LT-10222 Vilnius, Lithuania
Abstract:Polypyrrole (PPy) has been synthesized by a chemical oxidation method using ammonium persulfate to obtain a solution processable PPy powder. The resultant PPy powder was then solution processed to deposit flexible thin films of PPy over flexible substrates. PPy film samples were then characterized using UV–vis spectroscopy, FTIR spectroscopy and X-ray diffraction. It was found that conductivity of PPy (σ=2.4×10?2 S/cm) reduces by an order of magnitude after solution processing in the form of films. The temperature dependent conductivity of PPy pellet and flexible films of PPy were measured in the temperature range of 80–300 K. It was observed that PPy films show stronger temperature dependence than pelletized samples. Charge transport in PPy samples has been investigated using Kivelson?s and Mott?s variable range hopping models. Mott?s parameters such as density of states at the Fermi level N(EF), average hopping distance (R) and average hopping energy (W) have been estimated for PPy samples. The results showed that at room temperature average hopping distance for PPy film was about 22.3 Å and average hopping energy was 128.6 meV.
Keywords:Flexible thin films  Polypyrrole  Charge transport  Variable range hopping  Solution processed polypyrrole
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