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Öğe Electrochemical Capacitance of Cobalt Oxide Nanotubes on Nickel Foam(Polish Acad Sciences Inst Physics, 2013) Yagmur, V.; Atalay, F. E.; Kaya, H.; Avcu, D.; Aydogmus, E.In this study, densely packed Co3O4 nanotubes for supercapacitors have been obtained by means of chemically depositing cobalt hydroxide within a porous anodic aluminum oxide and then annealed at 360 degrees C. The morphological properties obtained Co3O4 nanotubes were studied by scanning electron microscopy, the chemical composition was determined by examination of the energy dispersive X-ray spectra. Supercapacitor characteristics such as charging/discharging and impedance (Z) characteristics were also examined. DOI: 10.12693/APhysPolA.123.215Öğe Electrochemical Impedance of Sn Nanowire Arrays(Polish Acad Sciences Inst Physics, 2014) Kaya, H.; Aydogmus, E.; Avcu, D.In this study, Sn nanowires were produced electrochemically in anodic aluminum oxide membranes. During the deposition process some parameters such as ion content, pH, deposition time, and temperature of solution were kept constant. The scanning electron microscope results showed that the diameters of produced tin nanowires were approximately 300 nm and their lengths were about 8-10 mu m. Electrochemical impedance studies of Sn nanowire arrays were also studied by Iviumstat galvanostat/potentiostat system.Öğe The Fabrication of NiO Microtubes Using Bacillus subtilis Bacteria(Polish Acad Sciences Inst Physics, 2014) Atalay, F. E.; Asma, D.; Aydogmus, E.; Turanci, H.; Kaya, H.The nickel oxide microtubes with high surface-to-volume ratio have been achieved using the Bacillus subtilis bacteria. Surface properties of the metal-oxide nanostructured materials were investigated by electron microscopy. The surface area of that was also studied by the Brunauer-Emmett-Teller analysis method. The materials were used at the construction of supercapacitor as an electrode active material.Öğe The Formation of Free Standing NiO Nanostructures on Nickel Foam for Supercapacitors(Polish Acad Sciences Inst Physics, 2014) Atalay, F. E.; Aydogmus, E.; Yigit, H.; Avcu, D.; Kaya, H.; Atalay, S.In this study, free standing NiO nanostructures for supercapacitors were obtained by means of chemically depositing of nickel oxide on Ni foam and then they were annealed at various temperatures. The morphological properties of densely covered Ni foams were studied by scanning electron microscopy. Supercapacitor characteristics, such as charging/discharging and impedance characteristics, were also examined.Öğe Magnetoimpedance effects in a CoNiFe nanowire array(Elsevier Science Sa, 2013) Atalay, S.; Kaya, H.; Atalay, F. E.; Aydogmus, E.This report describes the growth of CoNiFe nanowires into highly ordered porous anodic alumina oxide (AAO) templates by DC electrodeposition at a pH value of 2.6. Scanning electron microscopy (SEM) observations revealed that the wires have diameters of approximately 270-290 nm and a length of 25 mu m. The energy dispersive X-ray (EDX) analysis indicated that the composition of the nanowires is Co12Ni64Fe24. Electrical contacts were created on both sides of the nanowire array, and their magnetoimpedance (MI) properties were investigated. The impedance value was initially 1.2 ohm at low frequency and increased to approximately 1000 ohm for a 33-MHz driving current frequency under no applied magnetic field. All the MI curves exhibited single peak behaviour due to the high shape anisotropy. The maximum MI change at the 33-MHz driving current frequency was 2.72%. The maximum resistance change was 5.4% at 33 MHz. (C) 2013 Elsevier B. V. All rights reserved.Öğe Magnetoimpedance Effects in Electrodeposited NiFe Nanowire Array(Polish Acad Sciences Inst Physics, 2014) Aydogmus, E.; Kaya, H.; Atalay, F. E.; Atalay, S.; Avcu, D.In this work, NiFe nanowires were grown in highly ordered porous anodic alumina oxide templates by dc electrodeposition at a pH value of 2.6. Scanning electron microscopy showed that wires have diameters of about 250 310 nm and length 25-30 mu m. The energy dispersive X-ray analysis showed that the composition of the nanowires is Ni65Fe35. Electrical contacts were made on both sides of the nanowire array and their magnetoimpedance properties were investigated. All the magnetoimpedance curves showed single peak behavior due to the high shape anisotropy. The maximum magnetoimpedance change at the 79 MHz driving current frequency was approximate to 1.45%Öğe Magnetoresistance of Electrochemically Produced NiFe and CoNiFe Nanowires(Polish Acad Sciences Inst Physics, 2014) Avcu, D.; Atalay, F. E.; Aydogmus, E.; Kaya, H.; Atalay, S.CoNiFe and NiFe nanowires were electrochemically produced by dc electrodeposition on highly ordered porous anodic alumina oxide templates. Scanning electron microscope images of nanowires after removing the alumina membrane showed that these nanowires are uniform with the diameters of about 220-300 nm and about 25-30 mu m length. The energy dispersive X-ray analysis showed that the composition of the nanowires is Ni88Fe12, Co7Ni82Fe11. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.Öğe Magnetoresistance of Electrodeposited Co/Cu Multilayer Nanowires(Polish Acad Sciences Inst Physics, 2015) Avcu, D.; Atalay, F. E.; Atalay, S.; Kaya, H.; Aydogmus, E.Co/Cu multilayer nanowires were electrodeposited potentiostatically on highly ordered porous anodic alumina oxide templates. Scanning electron microscopy (SEM) showed that wires have diameters of about 250-300 nm and length of 40-50 pm. Co/Cu multilayer nanowire arrays embedded in anodic alumina oxide were mechanically polished with diamond in a suspension of oil until the wires appeared. Then the top and bottom surfaces of the material were coated with a layer of Au with a thickness of 100 nm for electrical contacts. Magnetic field was applied by an electromagnet and resistance was measured by four point technique.
