In situ electrochemical SERS studies on electrodeposition of aniline on 4-ATP/Au surface |
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Authors: | Lian-sheng JIAO Zhijuan WANG Li NIU Jing SHEN Tian-yan YOU Shao-jun DONG Ari IVASKA |
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Institution: | 1. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Changchun, 130022, People’s Republic of China 2. Laboratory of Analytical Chemistry, Process Chemistry Centre, ?bo Akademi University, Biskopsgatan 8, FIN-20500, ?bo-Turku, Finland
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Abstract: | The electrochemical polymerization of 0.01 M aniline in 1 M H2SO4 aqueous solution on roughened Au surface modified with a self-assembled monolayer (SAM) of 4-aminothiophenol (4-ATP) has been investigated by in situ electrochemical surface-enhanced Raman scattering spectroscopy (SERS). The repeat units and possible structures of the electrodeposited polyaniline (PANI) film were proposed; i.e., aniline monomer is coupled in head-to-tail predominately at the C4 of aniline and amine of 4-ATP, and the thin PANI film is orientated vertically to substrate surface. Simultaneous Raman spectra during potential scanning indicate clearly that the ultrathin PANI film (in initial growth of the film) consists of semiquinone radical cation (IP+), para-disubstituted benzene (IP and IP+) and quinine diimine (NP) while it is oxidized, and without quinine diimine and semiquinone radical cation while reduced. Meanwhile, the results confirm that 4-ATP monolayer shows a strong promotion on the electrodeposition of aniline monomer, and a possible polymerization mechanism was proposed. |
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Keywords: | Aniline Electrodeposition Self-assembled monolayer In situ electrochemical SERS |
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