Thermoluminescence study of Mn doped lithium tetraborate powder and pellet samples synthesized by solution combustion synthesis

In this paper, the thermoluminescence (TL) dosimetric characteristics under beta-ray, x-ray and gamma-ray excitations of powder and pellet Mn-doped lithium tetraborates (LTB) which were produced by solution combustion synthesis technique were investigated, and the results were compared with that of TLD-100 chips. The chemical composition and morphologies of the obtained LTB and Mn-doped LTB (LTB:Mn) were confirmed by X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) and scanning electron microscopy (SEM) with EDX. LTB:Mn was studied using luminescence spectroscopy. In addition, the effects of sintering and annealing temperatures and times on the thermoluminescence (TL) properties of LTB:Mn were investigated. The glow curves of powder samples as well as pellet samples exposed to different beta doses exhibited a low temperature peak at about 100 °C followed by an intense principal high temperature peak at about 260 °C. The kinetic parameters (E, b, s) associated with the prominent glow peaks were estimated using Tm-Tstop, initial rise (IR) and computerized glow curve deconvolution (CGCD) methods. The TL response of integral TL output increased linearly with increasing the dose in the range of 0.1-10 Gy and was followed by a superlinearity up to 100 Gy both for powder and pellet samples using beta-rays. Powder and pellet LTB:Mn were irradiated to a known dose by a linear accelerator with 6 and 18 MV photon beams, 6-15 MeV electron beams and a traceable 137Cs beam to investigate energy response. Further, TL sensitivity, fading properties and recycling effects related with beta exposure of LTB:Mn phosphor were evaluated and its relative energy response was also compared with that of TLD-100 chips. The comparison of the results showed that the obtained phosphors have good TL dose response with adequate sensitivity and linearity for the measurement of medical doses

Ni doped ZnO, CdSe and CdSe/ZnO photoactive material development.

TEZ12868Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2017.Kaynakça (s. 115-127) var.XIX, 129 s. :_tablo ;_29 cm.Nanoyapılı ZnO, elektrokimyasal yolla indium kalay oksit kaplı cam (ITO) üzerine sulu ortamda çöktürülmüştür. ZnO nanoyapıların oluşumuna farklı çinko nitrat derişimlerinin etkisi ayrıntılı olarak FESEM tekniği ile araştırılmıştır. Bununla birlikte, sentez ortamına ilave edilen destek elektrolitin nanoyapılı ZnO filmlerin morfolojisi üzerindeki etkileri de incelenmiştir. Farklı çöktürme sürelerinde hazırlanan çubuk ve kule benzeri ZnO filmlerin morfolojik, kristalografik ve optik özelikleri ayrıntılı olarak FESEM, XRD, XANES ve UV-görünür spektrofotometri teknikleri kullanılarak çalışılmıştır. Nikel katkılı ZnO nanoyapılar elektrokimyasal biriktirme yöntemi kullanılarak sentezlenmiştir. Nikel katkılamanın ZnO ince filmlerin morfolojik, kristalografik ve optik özellikleri üzerine olan etkileri incelenmiştir. CdSe nanofilmler ITO yüzeyine elektrokimyasal yöntem ile çöktürülmüştür. CdSe filmlerin morfolojisi, bileşimi, kristal yönelimi ve optik özelliğine çöktürme süresinin etkisi araştırılmıştır. ITO/CdSe elektrot üzerine ZnO nanoyapılar da elektrokimyasal yolla çöktürülmüştür. Tekli ve ikili nanoyapıların özellikleri FESEM, XRD ve UV-görünür spektrofotometri yöntemleri ile araştırılmıştır. Elektrokimyasal yolla sentezlenen fotoaktif elektrotların taşıyıcı yük yoğunluğu, düz bant potansiyeli gibi elektronik özellikleri Mott-Schottky eşitliği kullanılarak belirlenmiştir.Nanostructured ZnO films have been deposited in aqueous solution on indium tin oxide coated glass (ITO) substrate via electrochemical route. The effect of zinc nitrate concentrations on the formation of ZnO nanostructures have been investigated in detail by FESEM technique. The influence of the supporting electrolyte on the morphology of ZnO films was also examined. Morphological, crystallographic and optical properties of rod and tower like ZnO films was studied by using FESEM, XRD, XANES and UV-visible spectrophotometer techniques. Nickel doped ZnO nanostructures were synthesized by electrochemical deposition method. The efficacy of Nickel doping on morphological, crystallographic and optical properties of ZnO thin films was examined. CdSe nanofilms were deposited on ITO by electrochemical technique. The effect of deposition time on the morphology, composition, crystal orientation and optic property of CdSe films was investigated. Moreover, ZnO nanostructures were deposited on ITO/CdSe electrode via electrochemical route. The properties of prepared mono and bilayer nanostructures were investigated by FESEM, XRD and UV-visible spectrophotometer methods. Electronic properties like charge carrier density and flat band potential of electrochemically deposited photo active electrodes have been determined by using Mott-Schottky equation.Bu Çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi Tarafından Desteklenmiştir. Proje no: FEF2013D28

The synthesis and characterization of polyselenophene, polythiophene in ionic liquid.

TEZ8502Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2011.Kaynakça (s. 79-81) var.xiii, 83 s. : res. ; 29 cm.In this study, polyselenophene and polythiophene were synthesized on copper, platinium and ITO electrodes in ionic liquid environment. The synthesis of conducting polymers was utilized with cyclic voltammetry technique. The electrochemical characterization of the films were done. For this purpose, the film capacities and permability values were obtained. The structural characterization of these polymer films was investigated by using ATR-FTIR spectroscopy and surface morphology of the polymer films were characterized by SEM. The water uptaking behaviour with time of synthesized polymer films on copper electrodes was realized with Electrochemical Impedance Spectroscopy technique in diluted Harrison Solution. UV-Vis spektrofotometry technique was used to estimate the band gaps of polyselenophene and polythiophene films.Bu çalışmada, poliselenofen ve politiyofen iletken polimerleri bir iyonik sıvı ortamında bakır, platin ve ITO elektrotları üzerinde sentezlenmiştir. İletken polimerlerin sentezi dönüşümlü voltametri tekniği ile gerçekleştirilmiştir. Elde edilen iletken polimerlerin, elektrokimyasal karakterizasyonu gerçekleştirilmiş, filmlerin kapasitesi ve geçirgenliği belirlenmiştir. Yapısal karakterizasyonu ATRFTIR spektroskopisi ile morfolojisi ise SEM tekniği ile incelenmiştir. Bakır elektrot üzerine sentezlenen iletken polimerlerin zamanla su alma davranışları seyreltik Harrison çözeltisinde Elektrokimyasal İmpedans Spektroskopi tekniği ile gerçekleştirilmiştir. UV-görünür spektrofotometrisi ITO elektrot üzerinde sentezlenen poliselenofen ve politiyofen filmlerin bant aralıklarını hesaplamak için kullanılmıştır.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: FEF2011YL9

Synthesis and inhibitory effect of N,N’-bis(1-phenylethanol)ethylenediamine against steel corrosion in HCl Media

A new organic compound N,N’-bis(1-phenylethanol)ethylenediamine was synthesized and its inhibition efficiency was studied with electrochemical impedance spectroscopy and potentiodynamic measurement, as well as solution assay analysis. The influences of temperature and inhibitor concentration were investigated for explaining the inhibition mechanism. It was shown that both physical and chemical type adsorptive interactions occur via ?-bonding electrons, –NH and –OH groups. Besides, SEM, UV–visible and FTIR analyses were carried out to investigate the structure of protective layer formed on the steel surface. © 2017 Elsevier Lt

Preparations of different ZnO nanostructures on TiO2 nanotube via electrochemical method and its application in hydrogen production

In the present study, zinc oxide doped titanium dioxide nanotubes (ZnO/TiO2-NTs)were designed by using electrochemical deposition method. Titanium dioxide nanotubes (TiO2-NTs)were fabricated by anodization method. Nanostructured ZnO was deposited with various deposition times on TiO2-NTs. The morphological, structural, optoelectronic properties of ZnO/TiO2-NTs were examined in detail. The morphological and structural characterization of obtained electrodes was investigated with help of field emission scanning electron microscopy and X-ray diffraction. ZnO nanostructures with three different morphologies were obtained from nanotowers to nanoleafs. XRD results depicted that ZnO nanostructures have the high crystallinity with hexagonal wurtzite structure. The measurements of the contact angle were utilized to determine the wetting behavior of the obtained surface of materials. Electrochemical impedance spectroscopy measurement was used in 1 M KOH to investigate electrocatalytic behavior of the obtained materials towards hydrogen evolution reaction. Flat band potentials, as well as charge carrier densities, were determined by using Mott-Schottky analysis. The charge carrier densities were calculated as 1.06 × 1019 and 1.66 × 1020 cm-3 for TiO2-NTs and 30-ZnO/TiO2-NTs, respectively. The energy consumption and energy efficiency were determined for hydrogen evolution on ZnO/TiO2-NTs electrodes. © 2019 Hydrogen Energy Publications LL

A Copper Oxide (CuO) Thin Films Deposited by Spray Pyrolysis Method

A simple and low-cost procedure (spray pyrolysis) was used to elaborate a copper oxide thin films on ordinary glass substrates. A copper nitrate was used and dissolved in two different solutions (Water, Methanol) S1 and S2 respectively in order to obtain an equal concentration; CS1,S2=0.5M. The spray pyrolysis deposition made at fixed temperature T=500°C and different volumes of S1 or S2 on the glass substrates. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis spectrophotometry were used to determinate the structural, morphological and optical properties of CuO thin films. The X-ray diffraction patterns confirm the presence of the polycrystalline phase of CuO as monoclinic crystal structure with preferential orientation along (110), (002), (111), (200) and (020). Their optical band gaps ranged from 3.95 to 4.02eV for thin films made with S1, and from 1.6 to 1.95eV for thin films made with S2 with a high absorbency in the visible region, which is in agreement with the values of the literature

A Copper Oxide (CuO) Thin Films Deposited by Spray Pyrolysis Method

A simple and low-cost procedure (spray pyrolysis) was used to elaborate a copper oxide thin films on ordinary glass substrates. A copper nitrate was used and dissolved in two different solutions (Water, Methanol) S1 and S2 respectively in order to obtain an equal concentration; CS1,S2=0.5M. The spray pyrolysis deposition made at fixed temperature T=500°C and different volumes of S1 or S2 on the glass substrates. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-vis spectrophotometry were used to determinate the structural, morphological and optical properties of CuO thin films. The X-ray diffraction patterns confirm the presence of the polycrystalline phase of CuO as monoclinic crystal structure with preferential orientation along (110), (002), (111), (200) and (020). Their optical band gaps ranged from 3.95 to 4.02eV for thin films made with S1, and from 1.6 to 1.95eV for thin films made with S2 with a high absorbency in the visible region, which is in agreement with the values of the literature

Methyl 3-((2-mercaptophenyl) imino) butanoate as an effective inhibitor against steel corrosion in HCl solution

Methyl 3-((2-mercaptophenyl) imino) butanoate (MMPB) was designed and synthesized as a corrosion inhibitor, which is functionalized with adjacent azole and thiol groups and a carboxylate tail. The inhibition efficiency of this compound has been investigated in different concentrations of HCl solutions. Then, the effect of temperature and inhibitor concentration was studied for further discussion about inhibition mechanism. In addition to potentiodynamic and electrochemical impedance spectroscopy, galvanic measurements were also realized for better explanation of interaction between inhibitor and metal surface. For this purpose, identical steel electrodes were immersed in separate test solutions with and without inhibitor, and then coupled to each other. The assessment of corrosion rate was realized with quantitative analysis of iron content in immersion test solutions. The corrosion current densities (icorr) were 20.40 and 200.30 µA cm-2, in the presence of 10 mM inhibitor and inhibitor-free test solutions, respectively. The energy barrier values against corrosion were also calculated in the presence and absence of inhibitor, with the help of surface coverage ratio and icorr values for different temperatures. © 2014, Springer-Verlag Berlin Heidelberg