Nucleation and growth mechanism for the electropolymerization of aniline in trifluoroacetic acid/lithium perchlorate/propylene carbonate medium |
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Authors: | Email author" target="_blank">Bing-Joe?HwangEmail author Raman?Santhanam Chung-Ru?Wu Yin-Wen?Tsai |
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Institution: | (1) Microelectrochemistry Laboratory, Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, sec. 4, 106 Taipei, Taiwan, Republic of China |
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Abstract: | In the present work, the nucleation and growth mechanism for the electropolymerization of aniline in propylene carbonate medium
containing 0.06 M trifluoroacetic acid and 0.05 M lithium perchlorate was investigated at different potentials on highly oriented
pyrolytic graphite (HOPG) by potentiostatic current-time transients (i-t) and atomic force microscopic (AFM) measurements. The electrochemical data fitted with the theoretical curves for nucleation
and growth suggest that the electropolymerization of aniline consists of progressive nucleation followed by 3D growth at an
early stage and layer-by-layer growth in subsequent periods. The results obtained from transient analysis were in good agreement
with the results of the AFM analysis. In our previous studies with aqueous solutions, we observed only progressive nucleation
followed by a 3D growth mechanism for the electropolymerization of aniline in a higher potential range, 1.5–2.0 V vs. Ag/AgCl.
Hence, the results obtained from the present work indicate that the nucleation and growth mechanism depends on the medium. |
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Keywords: | Atomic force microscopy Layer-by-layer model Nucleation and growth Polyaniline |
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