The effect of ionic and electronic properties of titanium oxide on the electrochemical growth and redox behavior of polyaniline on titanium surfaces |
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Authors: | Kyriaki Saltidou Eleni Pavlidou Dimitra Sazou |
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Institution: | 1.Department of Chemistry,Aristotle University of Thessaloniki,Thessaloniki,Greece;2.Department of Physics,Aristotle University of Thessaloniki,Thessaloniki,Greece |
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Abstract: | Polyaniline (PANI) was electrodeposited directly from aniline (ANI)-containing sulfuric acid media on Ti|TiO2 electrodes, which were prepared in ANI-free 0.5 M H2SO4 solution by applying suitable anodization conditions in order to control the donor density (N D) in the oxide layer of a fixed thickness. By using the suggested procedure, reproducible conditions for the cyclic voltammetric growth of PANI on Ti can be achieved, and most importantly, the properties of Ti|TiO2|PANI electrodes can be modulated to meet the requirements for specific applications. The polymerization rate and the deposited amount of PANI were found to depend strongly on the N D estimated by Mott-Schottky analysis. The redox behavior of the resulted Ti|TiO2|PANI electrodes indicated differences in acid solutions as compared with the corresponding behavior of other PANI-modified metal surfaces. Analysis of the anodic and cathodic electrochemical response of the prepared Ti|TiO2|PANI electrodes discloses the significant role of ionic and electronic properties of the intervening oxide between the metal support and PANI. |
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