Person: ŞAFAK HACIİSMAİLOĞLU, MÜRŞİDE
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ŞAFAK HACIİSMAİLOĞLU
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Publication Electrodeposited CoFeCu films at high and low ph levels: Structural and magnetic properties(Springer, 2015-04-01) Koçkar, Hakan; Özergin, Ercüment; Karaağaç, Öznur; Alper, Mürsel; Kuru, Hilal; Hacıismailoğlu, Mürside; ALPER, MÜRSEL; ŞAFAK HACIİSMAİLOĞLU, MÜRŞİDE; Fen Edebiyat Fakültesi; Fizik Bölümü; 0000-0001-5648-3230; AAH-9719-2021; AAG-8795-2021CoFeCu films were electrodeposited at high and low pH, and their structural, magnetic and magnetoresistance properties were studied. Current-time transients were recorded to observe the proper deposition of the films. Crystal structure was displayed with X-ray diffraction. All films had a face centered cubic structure and the crystal structure was dominated by fcc-Co. The morphology and elemental composition of the films were determined by scanning electron microscope and energy dispersive X-ray spectroscopy, respectively. The surface of the film deposited at low pH has larger roundish shapes than that of the film deposited at high pH. The saturation magnetization increases from 1,210 to 1,413 emu/cm(3) and coercivity increases from 29 to 39 Oe as the electrolyte pH increases. All CoFeCu films showed anisotropic magnetoresistance. It is seen that electrolyte pH has an substantial affect on the morphological and magnetic properties of the films.Publication Pencil graphite/polypyrrole supercapacitors: The structural and chemical changes of the electrodes after capacitive measurements(Elsevier Science Sa, 2022-11-29) VATANSEVER, DİLEK; ŞAFAK HACIİSMAİLOĞLU, MÜRŞİDE; Fen Edebiyat Fakültesi; Psikoloji Bölümü; 0000-0001-5648-3230; IAR-4771-2023; AAH-9719-2021Polypyrrole (PPy) films were electropolymerized on pencil graphite electrodes (PGE). It is usual that for supercapacitor applications composite materials containing conductive polymers and low dimension carbon are being studied. PGE was employed as a substrate and also a source of carbon contributing to the capacitive effect. By this, a specific capacitance of 695 F/g, and a stability of 77% after 1000 times cycled was obtained. Moreover, a cheap, rapid and easy way to fabricate supercapacitor electrodes was found. A PGE/PPy symmetrical super -capacitor was produced. The energy and power density values were calculated as 38.76 Wh/kg and 227.99 W/ kg. The cycles showed remarkable charge/discharge capacity. Parallel connected several electrodes could enlighten an LED for a while.Publication Effects of the PPy layer thickness on Co-PPy composite films(Elsevier Science, 2015-08-25) Hacıismailoğlu, Mürşide; ŞAFAK HACIİSMAİLOĞLU, MÜRŞİDE; 0000-0001-5648-3230; AAH-9719-2021Co-PPy composite films were electrodeposited on ITO substrate from two different solutions potentio-statically. Firstly, the PPy layers with the thicknesses changing from 20 to 5000 nm were produced on ITO. Then Co was electrodeposited on these PPy/ITO substrates with a charge density of 1000 mC cm(-2). The electrochemical properties were investigated by the current density-time transients and the variation of the elapsed time for the Co deposition depending on the PPy layer thickness. X-ray photoelectron (XPS) spectra indicated the presence of both Co metal and its oxides on the surface. The weak reflections of the Co3O4, CoO and hcp Co were detected by the X-ray diffraction (XRD) technique. According to scanning electron microscopy (SEM) images, the thickness of the PPy layer strongly affects the Co nucleation. The composite films with the PPy layer thinner than 200 nm and thicker than 2000 nm have an isotropic magnetic behavior due to the symmetrical crystal field. The composite films with the PPy layer thicknesses between 200 and 2000 nm have an anisotropic magnetic behavior attributable to the deterioration of this symmetrical crystal field by the PPy bubbles on the surface. All films are hard magnetic material, since the coercivities are larger than 125 Oe.Publication Relation between ferromagnetic layer thickness (NiCu) and properties of NiCu/Cu multilayers (vol 26, pg 5014, 2015)(Springer, 2015-07-01) Kuru, Hilal; Koçkar, Hakan; Alper, Mürsel; Hacıismailoğlu, Mürşide; ALPER, MÜRSEL; ŞAFAK HACIİSMAİLOĞLU, MÜRŞİDE; Fen Edebiyat Fakültesi; Fizik Bölümü; 0000-0001-5648-3230; AAH-9719-2021; AAG-8795-2021