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    1-Aminoindanın camsı karbon (GC) elektrot yüzeyinde elektrokimyasal yükseltgenmesiyle bir yeni elektrodun hazırlanması
    (Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 2012-07-12) Bilici, Esra; Yazıcıgil, Zafer
    Bu tez çalışmasında, 1-Aminoindan (1AIn) maddesinin dönüşümlü voltametri tekniği ile camsı karbon (GC) elektrot yüzeyinde elektrokimyasal yükseltgenmesi sonucu 1-Aminoindan-modifiye camsı karbon (1AIn/GC) elektrot yüzeyi hazırlanmıştır. Yüzey modifikasyon deneyleri 1-Aminoindan maddesinin 100 mM tetrabütilamonyum tetrafloroborat içeren asetonitril ortamında hazırlanan 10,0 mM'lık çözeltisinde, +0,9/+1,5 V potansiyel aralığında, 100 mV/s tarama hızında 30 döngü tarama ile Ag/Ag+ referans elektroduna karşı gerçekleştirilmiştir. Bu şekilde hazırlanan modifiye elektrot yüzeyi; redoks problar varlığında dönüşümlü voltametri ve elektrokimyasal impedans spektroskopisi teknikleriyle, temas açısı ölçüm tekniği ile karakterize edilmiş, elde edilen karakterizasyon sonuçları yalın GC elektrot yüzeyine ait verilerle karşılaştırılmıştır. 1AIn/GC elektrot yüzeyine ait uygulama alanı bulabilmek amacıyla metal ve biyosensör çalışmaları yapılmıştır. Elde edilen sonuçlar değerlendirildiğinde 1AIn/GC elektrot yüzeyinin Cu(II) metal iyonlarına ve glukoz oksidaz enzimi varlığında glukoz moleküllerine karşı yüksek hassasiyette olduğu tespit edilmiştir.
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    Copper nanoparticle modified carbon electrode for determination of dopamine
    (PERGAMON-ELSEVIER SCIENCE LTD, 2012) Oztekin, Yasemin; Tok, Mutahire; Bilici, Esra; Mikoliunaite, Lina; Yazicigil, Zafer; Ramanaviciene, Almira; Ramanavicius, Arunas
    This paper reports the synthesis and characterization of copper nanoparticles (CuNPs) and application of copper nanoparticle-modified glassy carbon electrode for the electrochemical determination of dopamine. Electrochemical measurements were performed using differently modified glassy carbon (GC) electrodes. Bare, oxidized before modification and copper nanoparticle-modified glassy carbon electrodes (bare-GC, ox-GC and CuNP/GC electrodes, respectively) were characterized by cyclic voltammetry and electrochemical impedance spectroscopy in the presence of redox probes. Atomic force microscopy was used for the visualization of electrode surfaces. The CuNP/GC electrode was found to be suitable for the selective determination of dopamine even in the presence of ascorbic acid, uric acid, and p-acetamidophenol. The observed linear range of CuNP/GC for dopamine was from 0.1 nM to 1.0 mu M while the detection limit was estimated to be 50 pM. It was demonstrated that here reported glassy carbon electrode modified by copper nanoparticles is suitable for the determination of dopamine in real samples such as human blood serum. (C) 2012 Elsevier Ltd. All rights reserved.
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    Electrochemical determination of copper(II) using modified glassy carbon electrodes
    (DESALINATION PUBL, 2012) Bilici, Esra; Yazicigil, Zafer; Tok, Mutahire; Oztekin, Yasemin
    Electrochemical modification of glassy carbon (GC) electrode surface via electrochemical oxidation of 1-aminoindan in acetonitrile including 100.0 mM of tetrabutylammonium tetrafluoroborate and applicability of electrode modified in this way for electrochemical determination of copper(II) (Cu(II)) were reported in this study. Electrochemical surface modification was performed by cyclic voltammetry in the potential range between +0.9 and +1.5V vs. Ag/Ag+ (10.0 mM of AgNO3) at the scan rate of 100 mV/s by 30 potential cycles. The modified electrode surface was characterized by cyclic voltammetry, electrochemical impedance spectroscopy and contact angle measurement. The characterization results were compared with the characterization results of bare GC electrode. The results of the amperometric measurements of the modified GC electrode towards Cu(II) ions were investigated. It was determined that the modified electrode surface had electrochemical responses towards Cu(II) ions with high sensitivity, good selectivity, stability, reproducibility and repeatability. According to the results, it is believed that it will be possible to find an application area for this new surface in any industrial fields.
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    Investigation to Sensitive Determination of Glucose Using a Hybrid System Based on Graphene and Nickel Nanoparticles
    (IEEE, 2017) Incebay, Hilal; Bilici, Esra; Yazicigil, Zafer
    Nanoparticles has attracted great attention to many applications due to their extraordinary physical and chemical, mechanical, magnetic, optical, electrical and piezoelectric properties compared to bulk materials, which offer great promise in the development of nanotechnology to revolutionise the world through promising applications, including industry, agriculture, medicine, public health, and environment. On the other hand graphene has received much attention in the last years as a nanomaterial with many potential applications. In this study, solution of reduced graphene oxide, Ni metal nanoparticles were modified on the glassy carbon electrode surface and then graphene and metal nanaoparticle were formed hybrid systems. The modified electrode surfaces prepared in this way were characterized by electrochemically. The obtained results were compared with the results of bare GC. The prepared electrode surfaces were evaluated electrochemical response against different concentrations of glucose for the non-enzymatic and enzymatic glucose sensors application area.