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    Surface modification and characterization of phenanthroline nanofilms on carbon substrate

    Year: 2011

    Journal: Surface and Interface Analysis 2011, 43 (5) pp 923-930, 20121211

    Authors: Yasemin Oztekin, Zafer Yazicigil, Ali Osman Solak, Zafer Ustundag, Zeynel Kilic, Selen Bilge

    Organizations: Selcuk University, Faculty of Science, Department of Chemistry, Konya, Turkey; Vilnius University, Faculty of Chemistry, Center of Nanotechnology and Materials Science, Vilnius, Lithuania; Ankara University, Faculty of Science, Department of Chemistry, Ankara, Turkey; Dumlupinar University, Faculty of Arts and Sciences, Department of Chemistry, Kutahya, Turkey

    Modification of glassy carbon (GC) surfaces with phenanthroline derivatives (PDs) such as 5-amino-1,10-phenanthroline (5AP) and 5,6-diamino-1,10-phenanthroline (56DAP) is described in this study. Surface modification experiments were performed by cyclic voltammetry (CV) scanning from + 1.2 to + 2.7 V at scan rate of 100 mV/s applying 30 potential scans in acetonitrile (CH3CN) containing 1 mM PDs and 100 mM tetrabutylammoniumtetrafluoroborate (TBATFB). The presence of PDs on GC electrode was confirmed using CV, electrochemical impedance spectroscopy (EIS), contact angle measurements and ellipsometry and comparing with the results of bare GC electrode. A mechanism was proposed for the electrochemical modification of the GC electrode surface with PDs. The structure of the 5AP and 56DAP films was also discussed in the light of electrochemical and spectroscopic data. The complex-forming ability of the modified surfaces against metal cations was investigated by square-wave voltammetry (SWV). It was shown that surfaces having 1,10-phenanthroline ligands with different functional groups were quite useful for the determination of transition metal ions.