Yazar "Çetinkaya, Bekir" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim
    Öğe
    A light-detecting Ru(II)/Si heterojunction system involving a binuclear Ru (II) complex with pyridine-2,6-diimine (pydim) ligand
    (Springer, 2024) Koç, Mümin Mehmet; Dayan, Osman; Dere, Ayşegül; Çetinkaya, Bekir; Coşkun, Burhan; Yakuphanoğlu, Fahrettin
    A meticulously detailed chemical procedure was employed to synthesize the Ru (II)-containing pyridine-2,6-diimine (pydim) organometallic complex. The resulting complex was then applied to Al-coated Si wafers using the spin-coating technique, leading to the production of Al/Ru(II) organometallic complex/n-Si/Al photodiodes. The light responsiveness of these photodiodes was demonstrated through the acquisition of I-V and I-t characteristics. Subsequently, essential parameters such as ideality factor, photosensitivity, barrier height, and photoresponse values were evaluated based on the obtained I-V and I-t plots. The calculations yielded ideality factors and barrier heights, resulting in average values of 6.41 and 0.552 eV, respectively. Furthermore, an in-depth analysis of the electrical properties of the diodes was conducted using G-V and C-V assessments, revealing a strong dependence on AC signal frequency. This investigation underscored that the observed frequency-related electrical behaviour is rooted in series resistance and interface states.
  • Küçük Resim
    Öğe
    A Novel ruthenium(II) complex-based electrode for non-enzymatic glucose sensing applications
    (Springer, 2025) Küçükoflaz Korkmaz, Merve; Dayan, Serkan; Özdemir, Namık; Erdener, Diğdem; Dayan, Osman; Çetinkaya, Bekir
    Ruthenium-based complexes demonstrate high potential in the catalysation of the electrochemical oxidation of glucose, offering high sensitivity and stability in glucose detection. In this study, a ruthenium complex (Ru1) was synthesised using 2,2′-bipyridine-4,4′-dicarboxylic acid (DCBpy), potassium iodide (KI) and [RuCl₂(p-cymene)]₂. The structural properties of Ru1 were investigated using X-ray diffraction (XRD), nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and UV–vis spectroscopy analyses, which revealed its structure. The electrochemical behaviour of the Ru1 complex was systematically investigated and found to be promising for application in a glucose biosensor. Cyclic voltammetry measurements revealed an increase in electrochemical activity on the electrode surface over time, showing a steady rise at a potential of 0.32 V. This indicates high sensitivity and reliability in glucose detection. Chronoamperometric analysis showed a linear response to glucose concentrations ranging from 0.1 to 0.8 mM, demonstrating the sensor's sensitivity. These properties make the Ru1 complex a promising candidate for use in glucose detection biosensors. In conclusion, the complex's electrocatalytic activity and stability could be key to advancing biosensor technologies by enhancing sensitivity.
  • Küçük Resim
    Öğe
    Palladium(II) Complexes Containing 2,6-Bis(Imino)Pyridines: Synthesis, Characterization, Thermal Study, and Catalytic Activity in Suzuki Reactions
    (Taylor & Francis Inc, 2010) Dayan, Osman; Doğan, Fatih; Kaya, İsmet; Çetinkaya, Bekir
    A series of palladium complexes: [(Pydim)PdCl](PdCl3) (Pydim (1): pyridine-2,6-diimine) have been synthesized from palladium dichloride and the corresponding pydim. The Pd (II) complexes have been used as catalyst in the Suzuki reaction of aryl halides. Moreover, thermal behaviors of palladium complexes have been studied in nitrogen atmosphere using TG/DTG and DTA techniques. The values of activation energy Ea, and reaction order n, the entropy change S*, enthalpy change H#, and Gibbs free energy change G# of the thermal decomposition were calculated by means of several methods based on the single heating rate.
  • Küçük Resim
    Öğe
    Synthesis of a cationic ruthenium(ii) complex and its non-enzymatic glucose-sensing properties
    (Royal Society of Chemistry, 2023) Dayan, Serkan; Özdemir, Namık; Erdener, Diğdem; Dayan, Osman; Çetinkaya, Bekir
    The new cationic ruthenium(ii) complex (2) was synthesized via the reaction of N,N′-[1,1′-(pyridine-2,6-diyl)bis(ethan-1-yl-1-ylidene)]bis(2-ethyl-6-methylaniline) and [RuCl2(p-cymene)]2, and it was fully characterized using NMR, FT-IR, single-crystal X-ray diffraction, ESI-MS, UV-vis, CV and thermal analysis methods; theoretical computational characterizations and geometric parameters for 2 were also carried out via quantum chemical calculations using the density functional theory (DFT) method. In addition, the synthesized Ru(ii) complex (2) was immobilized on fabricated RGO-TiO2@FTO to evaluate its non-enzymatic biosensing properties, and the sensing properties of the resulting Ru(ii)-RGO-TiO2@FTO electrode were recorded. As a glucose-sensing model, at an applied potential of +0.34 V, the Ru(ii)-RGO-TiO2@FTO electrode presented a moderately good sensitivity of 62.69 μA mM−1 cm−1. Various modifications of Ru(ii)-RGO-TiO2@FTO-type electrodes, such as the metal complex, and material types and ratios, will enable the design of future biosensor devices with improved performance.