Yazar "Oksuz, Aysegul Uygun" seçeneğine göre listele

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    Öğe
    Investigation of the electrochemical behaviors of fibers containing new pyrazolo[5,1-c][1,2,4]triazine derivatives
    (Taylor & Francis Inc, 2023) Maslakci, Neslihan Nohut; Eren, Esin; Dulgerbaki, Cigdem; Yildirim, Fati; Oksuz, Aysegul Uygun
    Electrospun fibers of 7-methyl-4-phenyl-8-(4'-methoxy)phenylazopyrazolo[5,1-c][1,2,4]triazine-3-carboxylic acid ethyl ester (PCA-4) and 7-methyl-4-phenyl-8-(2'-methoxy)phenylazopyrazolo[5,1-c][1,2,4]triazine-3-carboxylic acid ethyl ester (PCA-2) were produced using electrospinning technique. Poly(methylmethacrylate) (PMMA) was used as support electrospun polymer. The morphological and chemical characterizations of the PCA-4/PMMA and PCA-2/PMMA electrospun fibers were carried out by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis (SEM-EDX). The electrochemical behavior of the PCA-4/PMMA and PCA-2/PMMA fibers onto ITO electrodes was examined by cyclic voltammetry (CV) measurements. The new PCA-4/PMMA and PCA-2/PMMA fibers were used for phosphate anion sensing. PCA-4/PMMA fiber indicated the best current response to 0.2 M phosphate buffer solution at -0.67 V.
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    Öğe
    Iron oxide/poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) glassy carbon electrode as a novel label-free electrochemical microRNA-21 sensor
    (Taylor & Francis Inc, 2024) Dulgerbaki, Cigdem; Oksuz, Aysegul Uygun
    MicroRNAs (miRNAs), a type of non-protein-coding and small RNAs, are encouraging molecular biomarkers for prior diagnosis of the certain diseases. Here, an electrochemical sensor based on iron oxide/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate (Fe3O4/PEDOT:PSS) hybrid coated glassy carbon electrode (GCE) is reported to determine microRNA-21 (miRNA-21) as a biosensing platform based on hybridization event. The biosensor was characterized by cyclic voltammetry (CV) measurements. The Fe3O4/PEDOT:PSS demonstrated good sensing performance, including a wide detection range (0.1 pM-1 mu M) and a low detection limit (0.023 pM) for potential medical applications.
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    Öğe
    Poly(3-methylthiophene)/Tungsten oxide hybrid materials for highly efficient electrochromic devices
    (Elsevier, 2021) Dulgerbaki, Cigdem; Oksuz, Aysegul Uygun
    Enhanced electrochemical and optical properties of poly(3-methylthiophene)/tungsten oxide (PMeT/WO3) hybrid nanostructure based electrochromic devices (ECDs) are presented. Hybrid nanostructures were prepared by electrodeposition technique in the presence of four different ionic liquids; 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (BMIMTFSI) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide (BMPTFSI). The electrochromic behaviors of the ECDs were investigated using cyclic voltammetry, chronoamperometry and transmittance measurements. PMeT/WO3/BMIMTFSI based ECD revealed excellent electrochromic properties of broad optical modulation (57.92%) and great coloration efficiency (398.32 cm2/C). Morphological structures of the thin films were examined by a scanning electron microscope (SEM), which showed that remarkable optical properties of PMeT/WO3 hybrid synthesized in BMIMTFSI medium can be attributed to the spongy network structure. The improved performance of the PMeT/ WO3 hybrid electrodes and the facile synthesis through electrodeposition method demonstrate a viable strategy for preparing fast assembling high-performance hybrid electrodes for a wide variety of electrochemical devices.