Utkan Sahinturk

Utkan Sahinturk
Istanbul University-Cerrahpasa, Vocational School of Technical Sciences

Assistant Professor

About

20
Publications
1,533
Reads
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154
Citations
Citations since 2017
12 Research Items
149 Citations
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20172018201920202021202220230102030
20172018201920202021202220230102030

Publications

Publications (20)
Poster
Full-text available
Graphene oxide (GO) is a nanomaterial which can be prepared from graphite in large amounts and processed from solution. It has attracted interdisciplinary attention for its broad applications across the fields of physics, chemistry and medicine. GO based materials are a pormising platform for electronic nanodevices, energy-storage materials, transp...
Article
In this paper, we proposed that CoNi-alloy nanoparticles (NPs) can be directly encapsulated carbon nanofibers (CNFs) via electrospinning process followed by heat treatment. By adjusting the concentration of the Co/Ni metallic salts, the electrochemical properties of the resultant nanofibers can easily be tuned. CoNi-alloy NPs embedded in CNF result...
Article
Full-text available
In this paper, we proposed the synthesis of CoFe nanoparticles (NPs) which have been deposited on carbon nanofibers (CNFs) with a facile electrospinning route followed by thermal reduction. The performance of obtained CNF supercapacitors are improved from 51 to 190 F/g (247 mF/cm2) at 0.5 A/g with the combination of CoFe NPs and graphitized carbon...
Article
The influence of ultraviolet (UV) radiation on the structural and uniaxial tensile characteristics of reduced graphene oxide (rGO)/poly(vinyl alcohol) (PVA) composite films produced by using various contents (0‐10 wt%) of rGO obtained by a microwave‐assisted reduction process was investigated. With increasing rGO content, significant reinforcing ef...
Article
Electrochemical properties of porous nickel (Ni) foam, electrodeposited zinc (Zn) on Ni foam (Ni–Zn) and electrodeposited reduced graphene oxide (rGO) on Ni–Zn foam electrodes (Ni–Zn-rGO) in 6 M KOH electrolyte were investigated. Cyclic voltammetry (CV) and galvanostatic charge–discharge cycling (GCD) techniques were used to carry out the redox int...
Article
For energy storage applications, hexylsulfanyl-substituted CoPc and GO-CoPc electrodes were prepared on Ni foam, and then electrochemical properties of the materials were investigated. The GO-CoPc nanocomposite electrode exhibits 56 mFcm[Formula: see text] at 1.4 mAcm[Formula: see text] current density. The results show that the GO-CoPc nanocomposi...
Article
Optical transmittance and electrical properties of polystyrene (PS)/reduced graphene oxide (rGO) composites were studied. Photon transmission technique was used to monitor the optical transmittance and two‐/four‐probe methods were used for the electrical conductivity measurements. Two separate experimental sets were prepared. In the first set, the...
Article
The spectroscopic, uniaxial tensile, and thermal properties of reduced graphene oxide (rGO)-poly(vinyl) alcohol (PVA) composite films produced by using rGO synthesized using modified Hummer's method with varying weight ratio of rGO up to 10% were investigated by using an uniaxial tensile tester, Fourier Transform Infrared (Ft-IR)/Attenuated Total R...
Article
Composite films of Na-Alginate (Alg) and Polystyrene (PS), which have different glass transition temperatures (Tg), with different weight ratios were prepared. Characterization of the film formation process was carried out by using the photon transmission (PT) measurements and the scanning electron microscopy (SEM) imaging. The composite films were...
Article
Waterborne few-layer graphene oxide/poly(methyl methacrylate-co-butyl acrylate), FLGO/poly(MMA-co-BuA), nanocomposites were synthesized by in situ emulsion polymerization. The FLGO nanosheets used in this study was prepared by modified Hummers method and followed by a exfoliation process. The obtained FLGO and both latex and film forms of the nanoc...
Article
In this study, UV-visible(UVV) technique was used to probe the evolution of optical transmission during the film formation from composites of polystyrene (PS) latex particles and poly acrylamide (PAAm) films annealed by the infrared radiative heating (IRH) and convectional heating. Activation energies corresponding to the void closure and the inter...
Article
Poly(vinyl alcohol) as pure or composite materials is widely used in the food and textile industries, andbiomedical applications due to some important properties such as uniaxial tensile, biocompatibility, and noncarcinogenicity. Investigation of the influence of the film thickness and heating on the uniaxial tensile, spectroscopic, and surface pro...
Poster
Full-text available
Novel flexible sensors were fabricated by covalently bonding graphene oxide (GO) to a metallo phthalocyanine on a plastic substrate, and then partially reducing the GO film. The effects of the reduction of the GO film on the electrical and sensing properties of the reduced GO/ZnPc film were investigated. The anchored partially reduced GO/ZnPc film...
Poster
Full-text available
In this work, azido graphene oxide(GO-N₃) nanosheets were electrochemically reduced on nickel foam(NF) by a rapid and eco-friendly method without using harmful reducing agents. Electrochemically reduced azido graphene oxide (ERGO-N₃)/NF electrodes were prepared without any conductive agent and binder.
Poster
Full-text available
Phthalocyanines (Pcs) are functional materials with an extended conjugated network of π-electrons[1]. Their outstanding dye properties and the ability to self-assemble, by means of π-π interactions, into highly ordered arrays can be tuned by careful design of their periphery such as quinoline moiety [2]. In this work, quinoline derivative (3) of te...
Article
Full-text available
In this study Fe-Si binary alloy containing 8 at. % Si and pure iron were pack boronised at 900°C, 1000°C and 1100°C for 3 h using Ekabor II powder. The microstructure, chemical composition, phase contents and microhardness of the formed boride coatings were characterized by means of XRD, SEM-EDS and Vickers Microhardness measurements. The saw-t...

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Projects

Projects (2)
Archived project
Synthesis, Characterization of water soluble Metallo Phthalocyanines, Synthesis od Graphene derivatives, Investigation of Pysical and Sensor Properties of hybrid materials including MPc and Graphene