Electrochemical synthesis, characterisation and comparative study of new conducting polymers from amino-substituted naphthalene sulfonic acids
| Autor: | Alemnew Geto, Christopher M.A. Brett |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Conductive polymer
chemistry.chemical_classification Materials science Inorganic chemistry 02 engineering and technology Polymer Glassy carbon 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Dielectric spectroscopy chemistry.chemical_compound Monomer chemistry Polymerization Electrode General Materials Science Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Solid State Electrochemistry. 20:2969-2979 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-016-3338-9 |
| Popis: | Conducting polymers have been synthesised electrochemically from 4-amino-3-hydroxynaphthalene-1-sulfonic acid (4A3HN1SA), 4-aminonaphthalene-1-sulfonic acid (4AN1SA) and 7-amino-4-hydroxynaphthalene-2-sulfonic acid (7A4HN2SA) on glassy carbon electrodes. The influence of the positive potential limit on the potential cycling polymerisation of 4A3HN1SA was studied, and a sufficiently high potential limit allowed better film growth. Under similar polymerisation conditions, the three monomers showed different radical formation potentials and different voltammetric peak profiles. The effects of scan rate and solution pH on the electrochemical properties of the polymers were investigated, in the range between 10 and 200 mV s−1, all the modified electrodes showing a surface-confined electrode process. In the pH range from 2.0 to 9.0, the anodic peak potentials decreased linearly with increasing pH for all the three modified electrodes. The modified electrodes were characterised by electrochemical impedance spectroscopy in pH 4.0 and 7.0 buffer solutions. The results showed a more porous poly(7A4HN2SA) film, which is less affected by pH change than the other two films. Scanning electron microscopy of the polymer films also showed significant differences in their morphologies. |
| Databáze: | OpenAIRE |
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