Preparation and characterization of diethylene glycol bis(2-aminophenyl) ether-modified glassy carbon electrode

Isbir A. A., Solak A. O., Ustundag Z., Bilge S., Kilic Z.

Analytica Chimica Acta, cilt.573-574, ss.26-33, 2006 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 573-574
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.aca.2006.03.056
  • Dergi Adı: Analytica Chimica Acta
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.26-33
  • Anahtar Kelimeler: cyclic voltammetry, diethylene glycol bis(2-aminophenyl) ether-modified glassy carbon electrode, electrografting, Raman spectroscopy, electrochemical impedance spectroscopy, COVALENT MODIFICATION, ELECTROCHEMICAL REDUCTION, ORGANIC MONOLAYERS, RAMAN-SPECTROSCOPY, TRANSFER KINETICS, FIBER SURFACES, FILMS, DNA, VOLTAMMETRY, CHEMISTRY
  • Ankara Üniversitesi Adresli: Evet

Özet

Diethylene glycol bis(2-aminophenyl) ether (DGAE) diazonium salt was covalently electrografted on a glassy carbon (GC) surface and behavior of this novel surface was investigated. Synthesis of DGAE diazonium salt (DGAE-DAS) and in situ modification of GC electrode were performed in aqueous media containing NaNO2, keeping the temperature below +4 °C. For the characterization of the modified electrode surface by cyclic voltammetry, dopamine (DA) was used to prove the attachment of the DGAE-DAS on the GC surface. Raman spectroscopy and electrochemical impedance spectroscopy (EIS) were used to observe the molecular bound properties of the adsorbates at the DGAE-modified GC surface (GC-DGAE). The EIS results were analyzed using the Randles equivalent circuit. The charge transfer resistance on bare GC and the modified surface were calculated using the model equivalent circuit for the ferrocene redox system. Surface coverage was found as 0.4 showing the presence of high pinhole and defects in the modified electrode. The rate constant of electron transfer through the monolayer was calculated for ferrocene. Working potential range and the stability of the DGAE-modified GC electrode was also determined. © 2006 Elsevier B.V. All rights reserved.