Yazar "Cakmak, D." seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim
    Öğe
    Electrocatalytic Investigations of Cu(II) and Fe(III) Complexes of Salophen Derivative Schiff Bases on the Pencil Graphite Electrode
    (Wiley-V C H Verlag Gmbh, 2020) Cakmak, D.; Bulut, T.; Uzun, D.
    This present study describes a pencil graphite electrode surface covered with Cu(II) and Fe(III) complexes based on Salophen derivative Schiff bases in acetonitrile solution containing LiClO4 as a supporting electrolyte. Cyclic voltammetry method was used for the surface modification procedure with 25 cycle at a sweep rate of 50 mV s(-1). Some characterization methods were used to identify of the prepared modified surfaces including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Ultraviolet-visible Spectroscopy (UV-Vis), and Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/SEM-EDX). The catalytic activity of these modified surfaces on the electrochemical oxidation of catechol (CC) was investigated and they compared with each other. The results demonstrated that these modified electrodes showed perfect electrocatalytic activity on the catechol determination, however the modified electrode prepared with the Cu(II) complex has higher catalytic activity than this prepared with the Fe(III) complex thanks to its the lower detection limit.
  • Küçük Resim
    Öğe
    Electropolymerization and characterization of salophen derivative Schiff base Co(II) and Ni(II) complexes on the graphite electrode and electrocatalytic investigations
    (Bulgarian Acad Science, 2017) Cakmak, D.; Bulut, T.
    In this study, pencil graphite electrode surfaces were modified with Salophen derivative Schiff base Co(II)and Ni(II) complexes. Surface modification procedure was carried out by electrochemical oxidation method at 0.0-2.0 V potential range in acetonitrile containing 0.15 M LiClO4 as a supporting electrolyte medium. The prepared modified surfaces were characterized by cyclic voltammetry, EIS, FT-IR UV-Vis and SEM/SEM-EDX techniques. Modification of surfaces was confirmed by results of characterization studies. The electrocatalytic activity of modified electrodes was investigated upon bioanalytical species like ascorbic acid, catechol, cysteine etc. It was seen that both modified electrodes showed excellent electrocatalytic activity on catechol, but the catalytic activity potential of the electrode modified with Co (II) complex was higher on the other species.
  • [ N/A ]
    Öğe
    Immobilization of salophen derivative Schiff base cobalt(II) complex on a copolymer coated platinum electrode and electrocatalytic investigations
    (Bulgarian Acad Science, 2016) Cakmak, D.; Yalcinkaya, S.; Seymen, K.; Demetgul, C.
    In this study, o-amino-benzylalcohol (pBA) and o-anisidine (pA) homopolymers and their copolymer (o-aminobenzylalcohol- co-o-anisidine) (Cp) were synthesized on the platinum electrode in 0.5 M H2SO4 as a supporting electrolyte medium by electrochemical methods. Then, Co(II) complex of salophen type Schiff base (CoL) was immobilized on these polymer coated electrode surfaces in acetonitrile containing 0.15 M LiClO4. The prepared modified surfaces were characterized by Cyclic Voltammetry, UV-Vis, SEM-EDAX and ICP-MS techniques. The electrocatalytic activity of modified electrodes was investigated on electrooxidation of Dopamine (DA) as biosensor application. One of the prepared modified electrodes showed good electrocatalytic effect on the oxidation of DA using Square Wave Voltammetry method (SWV). The oxidation peak current of DA increased linearly in the range of 0.2 mu M - 2 mM in pH 7 phosphate buffer solution at left perpendicular CoL right perpendicular immobilized pA modified Platinum electrode. Limit of Detection (LOD) was calculated as 0.1 mu M for DA determination.