Impedance study of thiolated polyaniline |
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Authors: | Maija Blomquist Johan Bobacka Ari Ivaska Kalle Levon |
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Institution: | 1. Laboratory of Analytical Chemistry, Process Chemistry Centre, ?bo Akademi University, Biskopsgatan 8, 20500, Turku/?bo, Finland 2. Nanoscience Center, The Finnish National Graduate School in Nanoscience (NGS-NANO), University of Jyv?skyl?, P.O. Box 35, 40014, Jyv?skyl?, Finland 3. Chemical and Biological Sciences, Polytechnic Institute of New York University, Six Metro Tech Center, Brooklyn, NY, USA
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Abstract: | Covalent attachment of thiolated probes to conducting polymers such as polyaniline (PANI) is a promising approach towards the development of electrochemical sensors and biosensors. However, thiolation alters the conjugated polymer backbone and influences the electrochemical behavior of the conducting polymer. PANI studied in this work was electropolymerized on glassy carbon (GC) electrodes from a solution of 0.1 M aniline in 0.5 or 1.0 M H2SO4. The GC/PANI electrodes were then functionalized by covalent attachment of 2-mercaptoethanol to the PANI backbone. The progress of thiolation was studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Thiolation of PANI was found to cause an initial decrease in electroactivity at 0–0.25 V and an increase in electroactivity at 0.25–0.6 V. However, prolonged thiolation caused a loss of electroactivity of PANI, which could be seen from EIS measurements as a dramatic decrease in the bulk redox capacitance of PANI. |
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