Influence of ionic dopants on the conductivity of electrochemically synthesized polypyrrole |
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| Institution: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;3. Center of Materials Science and Optoelectronics Engineering，University of Chinese Academy of Sciences, Beijing 100049, China;4. Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China;1. Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki, Cairo 12622, Egypt;2. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, P.O. Box 11562, Cairo, Egypt;3. Molecular Modeling Unit, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, P.O. Box 11562, Cairo, Egypt;4. Department of Pharmaceutical Chemistry, Faculty of Pharmacy, New Giza University, Newgiza, km 22 Cairo-Alexandria Desert Road, Cairo, Egypt;1. PG and Research Department of Physics, Chikkaiah Naicker College, Erode 638 004, Tamil Nadu, India;2. Department of Physics, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai, Tamil Nadu 602105, India;3. Department of Electrical and Electronics Engineering, Paavai Engineering College (Autonomous), Namakkal 637 018, Tamil Nadu, India;1. Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan;2. Department of Biology, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan |
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| Abstract: | Comparison of elemental analytical, XPS and SIMS data allows a semi-quantitative assessment of the dopant and oxidation states of polypyrrole synthesized using a variety of potentials and electrolyte concentrations. Studies of polypyrrole grown in aqueous solution indicate, contrary to previous reports, that a maximum in the conductivity is observed for films grown close to the oxidation-reduction potential and in agreement with our previous observations on organically grown polypyrrole.Treatment of electrochemically synthesized polypyrrole with sodium hydroxide leads to a reduction in the electrical conductivity by three orders of magnitude and similarly the addition of hydrochloric acid causes an increase in the electrical conductivity by several orders of magnitude. It was found, by comparison of films of different thicknesses that the initial time lag in the decrease in the conductivity on exposure to sodium hydroxide is a result of diffusion controlled deprotonation, whereas the protonation reaction causes an almost instantaneous increase in the electrical conductivity. |
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