Sadik Cogal

Burdur Mehmet Akif Ersoy University · Chemistry

Perovskite solar cells have shown rapid development in efficiency since it was first produced. As a result of this development, efficiency values have reached ~ 25%. However, their efficiency decreases significantly after production. This decrease in efficiency values is called degradation or instability. Determining the source of this degradation...

İki boyutlu (2D) geçiş metal dikalkojenit (TMD) malzemeler sundukları üstün özelliklerden dolayı son yıllarda çok dikkat çekmektedirler. Bu çalışmada, TMD malzemelerin önemli bir üyesi olan molibden diselenür (MoSe2) hidrotermal yöntem ile sentezlenmiş ve çeşitli yöntemlerle yapısal ve morfolojik açıdan incelenmiştir. Analiz sonuçları, MoSe2’ün bir...

İki-Boyutlu nanomalzemeler, sahip oldukları eşsiz özelliklerden dolayı son yirmi yılda oldukça fazla dikkat çekmişlerdir. Bu malzemeler, sadece nano ölçeğin sağladığı sıra dışı özelliklerden değil aynı zamanda atom kalınlığına kadar inebilen yapıları nedeniyle çok yönlü özelliklere sahiptirler. İki-boyutlu nanomalzemeler elde edildikleri katmanlı f...

The development of sensitive and selective electrodes for electrochemical detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA) is essential for early diagnosis and effective treatment. In this work, a nanocomposite of two-dimensional WSe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</s...

In the present work, a nanocomposite of two-dimensional WSe2 nanosheets with poly(3,4‑ethylenedioxythiophene (WSe2@PEDOT) was prepared by facile hydrothermal method and characterized in terms of structural and morphological analyses. This nano­composite was used to modify glassy carbon electrode for the construction of an electrochemical sensing pl...

An electrochemical-sensing platform for determination of dopamine (DA) was fabricated using MnO2–polyaniline (MnO2–PANI) composite. The MnO2–PANI composite was prepared through in situ radio-frequency plasma polymerization of aniline monomer over MnO2 under rotating conditions and followed by external iodine doping to boost conductivity of final I2...

Defect and interface engineering have been shown as effective strategies towards sustainable hydrogen production, but detailed descriptions of the origin of performance enhancements is not established. Here, we synthesize a model heterostructure interface, CoSe 2 ‐MoSe 2 /PEDOT, to unravel its bifunctional capability. Low η 10 of ‐0.20 V for HER an...

Electrochemical water splitting could be an efficient alternative route for clean and renewable energy storage. However, widespread application of this technique is hindered by the high overpotential required for the sluggish anodic oxygen evolution reaction (OER). In this contribution, we report that novel N based conducting polymers exhibit excel...

Dopamine (DA) is biologically important molecule, which plays a vital role in hormonal, renal, cardiovascular, and central nervous systems. Since abnormal level of this biological molecule leads to several diseases, its accurate and fast monitoring is of great importance for clinical diagnosis and treatment. The electrochemical approaches have beco...

Nanocomposites of graphene (GR) with polythiophene (PTh) or poly(3,4-ethylenedioxythiophene) (PEDOT) through a versatile and environmentally benign process, utilizing radio frequency (RF) plasma polymerization, were made. The morphological characterization of these nanocomposites was performed using various microscopy techniques and it revealed tha...

A new lactose biosensor was developed by preparing a suitable copolymer of polypyrrole and poly(3,4-ethylenedioxythiophene) synthesized using the electropolymerization method. Pyrrole and 3,4-ethylenedioxythiophene monomers were deposited in the presence of sodium dodecylbenzene sulphonic acid on a platinum disc electrode, which was used as the wor...

The preparation of polyfuran–graphene (PFu/GR) and polyfuran–multi-walled carbon nanotube (PFu/MWCNT) nanocomposites was carried out via a plasma polymerization. The characterizations of the pure GR, MWCNTs and the nanocomposites coated with PFu were performed using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scan...

Poly(3,4-ethylenedioxythiophene) was deposited on a reduced graphene oxide-decorated glassy carbon electrode through an electrochemical polymerization. The resulting glassy carbon electrode-reduced graphene oxide-poly(3,4-ethylenedioxythiophene) electrode was applied as an electrochemical biosensor for the determination of dopamine in the presence...

This study presents the preparation of graphene (GR) nanocomposites with polyaniline (PANI) and polypyrrole (PPy) through the fast, versatile and environmentally friendly process of radio frequency (RF)-plasma polymerization. Morphological characterization of the nanocomposites is performed using scanning electron microscopy (SEM) and shows that th...

Dopamine (DA) is an important molecule in human metabolism and unusual level of this molecule leads to many diseases. Therefore, the accurate, fast and selective detection of DA is very important. Among the different methods for detection of DA, biosensors have attracted increasing attention due to their advantages including simple fabrication, low...

Porphyrins have been widely studied materials due to their importance in biological systems and for many applications in solar cells, photodynamic therapy, biological electron-transfer systems, catalysis and sensors. Porphyrins and their metal derivatives are very suitable for electron transfer based applications and catalytic applications due to t...

Multi-walled carbon nanotube (MWCNT) was modified via plasma polymerization of aniline by applying different radio frequency (RF: 13.56 MHz) powers. The modified MWCNTs were investigated in terms of morphology, chemical structure and thermal behaviors, indicating the formation of composites based on the surface modification of MWCNT with polyanilin...

Porphyrin sensitizer (Por) containing 4-carboxybiphenyl and 2-thienyl and its metallated Zn(II) derivative (ZnPor) were synthesized and investigated. The porphyrin dyes were characterized by MALDI-MS, ¹H NMR, UV–vis, fluorescence and cyclic voltammetry methods. It was found that using of biphenyl bridge between anchoring group and porphyrin core en...

Poly(3,4-ethylenedioxxythiophene) (PEDOT), polyaniline (PANI) and polythiophene (PTh) based multi-walled carbon nanotube (MWCNT) composites were successfully prepared using RF-rotating plasma grafting method. Morphological characterizations of composites were determined using scanning electron microscopy (SEM), which showed that conducting polymers...

This study presents the modification of multi-walled carbon nanotube (MWCNT) with poly(3-hexylthiophene) (P3HT) and polypyrrole (PPy) through the fast, versatile, and environmentally friendly process of radiofrequency (RF)-rotating plasma polymerization. Morphological characterization of composites was performed using scanning electron microscopy (...

Lactose content of milk is a basic indicator for the evaluation of milk quality. Various methods are used for the determination of lactose; however, many of these methods are generally time-consuming, labor-intensive and expensive for routine quality control applications. Biosensors offer a cheap, quick, and reliable alternative for lactose determi...

Graphene is the one-dimensional form of carbon and exhibits a considerable number of new and sometimes mysterious optical and electronic effects that have not been observed in other materials, such as zero-band-gap semi-conductivity with a high carrier mobility, high optical transparency and high tensile strength. Due to these properties, graphene...

Carbon nanotubes (CNT) is one of the most investigated materials before the invention of graphene. 1 Due to its unique properties, CNTs have been used in various applications include sensors, solar cells, transistors, etc. 2 However, it makes difficult to make nano-devices based on CNTs at a large scale. For this reason, formation of composite with...

Recently, electronically conductive polymers have been studied as the subject of numerous investigations [1-2]. Among the conductive polymers, which have aromatic ring and heteroatom in the backbone, polypyrrole (PPy) [3] have been of particular interest due to its high electrical conductivity, environmental stability and interesting redox properti...

The electrochemical copolymerization of pyrrole (Py) and 1-dimethylaminopyrrole (DMAPy) was successfully carried out in the presence of three different types of surfactant (anionic, cationic and non-ionic) by cyclic voltammetric method. The influence of anionic (sodium dodecylbenzenesulfonate) (NaDBS), cationic (tetradecyltrimethylammonium bromide)...

Hybrid solar cells have been fabricated using perylene monoimide–monoanhydride dyes with nanorod zinc oxide electrodes as electron transporting layers. We have investigated the influence of the spacer alkyl chain length of perylene monoimide–monoanhydride (PMIMA) dyes on the device performance in hybrid solar cells using nanorod zinc oxide electrod...

An efficient hydrothermal method is presented to synthesize ZnO nanostructures. We investigated the effects of reaction conditions by adjusting the amounts of NaOH, growth temperature, surfactant, annealing to control the morphologies of ZnO nanostructures. Critical amount of NaOH in our reaction system has great influence on the formation of ZnO n...

Conventional and microwave-assisted synthesis of ZnO nanorods have been performed with and without using PEG400. ZnO nanorods were synthesized with 50-250 nm of diameter which depends on the used surfactant and methods. Surfactant effects of PEG400 on the size and morphology of ZnO nanorods were investigated. The microwave method was compared to th...