Surface modification of gold electrodes with anthraquinone diazonium cations |
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| Authors: | Marko Kullapere Margus Marandi Väino Sammelselg Hebert A Menezes Gilberto Maia Kaido Tammeveski |
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| Institution: | 1. Institute of Chemistry, University of Tartu, Jakobi 2, 51014 Tartu, Estonia;2. Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia;3. Department of Chemistry, UFMS, CP 549, Campo Grande, MS 79070-900, Brazil |
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| Abstract: | Electrochemical grafting of anthraquinone (AQ) groups to gold electrodes was carried out in acetonitrile (ACN) and in aqueous acidic media (0.05 M H2SO4). For the first time, the covalent attachment of AQ to gold is demonstrated. Electrochemical quartz crystal microbalance (EQCM), atomic force microscopy (AFM) and cyclic voltammetry (CV) were used to characterise the AQ-modified Au electrodes. Electrografting from both solutions containing the corresponding diazonium salt yielded a strongly attached AQ layer. AFM examination showed that a multilayer AQ film was formed. The CV behaviour of the modified electrodes was tested in 0.1 M KOH and a quasi-reversible response was observed. |
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