Doping competition of anions during the electropolymerization of pyrrole in aqueous solutions |
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| Affiliation: | 1. Department of Biochemistry and Biotechnology, CSIR – CLRI, India;2. Centre for Nanobiotechnology, VIT University, India;3. Biological Materials Laboratory, CSIR – CLRI, India;1. Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;2. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China;3. Department of Biology and Chemistry, City University of Hong Kong, Hong Kong 999077, China;4. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Multi-disciplinary Research Division, Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China;5. College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou 310027, China;1. Institute of Chemistry, Federal University of Bahia, Campus Ondina, 40170-290 Salvador, BA, Brazil;2. Federal Institute of Bahia, Street Emídio dos Santos, n/n, Barbalho, 40301-015 Salvador, BA, Brazil;3. Braskem S.A.—Innovation and Technology Center—Pilot plants, PP1, III Petrochemical Polo, Via West, Lot 05, 95853-000 Triunfo, RS, Brazil;4. Institute of Chemistry, Federal University of Rio Grande do Sul, Avenue Bento Gonçalves, 9500, 91501-970 Porto Alegre, RS, Brazil |
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| Abstract: | The doping competition of anions in the electropolymerization of pyrrole was studied in aqueous solutions containing two kinds of anions with the same concentration of 0.1 mol dm-3. The composition analysis of the polypyrrole (PPy) films prepared shows that the doping amount of p-toluene sulfonate (TsO-) prevails over that of perchlorate, chloride and nitrate anions. The conductivity of the PPy film is close to the higher value of the two PPy films doped with a single anion. When polymerization is performed in the solution containing TsO- and NO3-, TsO-is mainly doped at Structure I, while NO3- is mainly at Structure II of the PPy film. |
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