
Sevda sarıtaşAtatürk University · Department of Physics, Faculty of Science
Sevda sarıtaş
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Publications (56)
In this study, a Zn-doped iron oxide layer was deposited onto a microscope slide using the magnetron co-sputtering technique with direct current (DC) and radio frequency (RF) sources. We comprehensively characterized the resulting Zn-doped Fe2O3 thin layer, employing techniques such as XRD, Raman spectroscopy, UV–VIS spectrophotometry, SEM, EDX, &...
TixFe3-xO4 and WxFe3-xO4 structures were grown. When examining the atomic percentages of the films grown under the same conditions as the EDX measurements, different ratios are observed in the WxFe3-xO4 structure (O: 71.05%, Fe: 4.22%, W: 24.74%). This is the opposite in the structure of TixFe3-xO4 (O; 58.16%, Fe; 41.68%, Ti; 0.17%). It is possible...
The pure and Fe-doped CuO thin films were successfully grown by using ultrasonic spray pyrolysis method (USP) onto glass substrates. The changes in structural, morphological, H2 gas sensor, and optical properties of the synthesized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAX), X-ray pho...
Bu çalışmada, sırasıyla DC magnetron ve RF magnetron püskürtme ile demir oksit ve bakır oksit yapıları büyütülmüş ve CuxFe3-xO4 yapısı ise birlikte püskürtme (Co-sputtering) ile büyütülmüştür. Büyütülmüş ince filmlerin yapısal optik ve topografik incelemeleri detaylı olarak yapılmıştır. İnce filmlerin absorpsiyon ölçümleri, oda sıcaklığında Perkin...
In this study, carmine films were deposited on glass slides and n-Si substrates using a spin coater. The scanning electron microscope (SEM) and absorbance analyses of the deposited carmine film on glass were performed. Twenty-four (24) Au/Carmine/n-Si/Ag dots were identically fabricated, and their current-voltage (I-V) characteristics were taken at...
Öz Bu çalışmada, demirin tungsten oksit yapısına katkılanması ve ardından 550oC'de tavlanması ile kristal yapı ve gaz sensör tepkisindeki değişimler incelenecektir. Absorpsiyon-dalga boyu ölçümleri sonucunda yapının hesaplanan bant aralığının 3,08-3,15 eV arasında olduğu görüldü. İnce filmlerin doğrudan optik bant aralığı enerjisi (Eg), Tauc denkle...
Samples of lithium borate glass-ceramics with a composition of 40Li2B4O7 + xBi2O3 + (55-x) ZrO4 + 5CaWO4 (x = 10 - 50 wt%) have been fabricated via ordinary melt quenching route. The physical and structural features have been investigated. Radiation shielding competence has been examined experimentally using an Ultra Ge detector with the 133Ba (3 C...
Optical, topographic, and structural characterization of chromium oxide thin film grown with the magnetron RF sputter technique was performed separately as pre-annealing and post-annealing in this study. Likewise, gas sensor measurement was made separately before and after annealing. The crystal structure of the films was analyzed by X-ray diffract...
In this study, GeOx films were produced by radio frequency magnetron sputtering (RFMS) under varying oxygen percentages. The structural and optical properties of films grown have been studied experimentally and theoretical calculations have been presented using density functional theory (DFT). Considering the x-ray diffraction (XRD) analysis, Ge (1...
Undoped and Ag doped ZnO thin films were grown on glass substrate at 500 °C by ultrasonic spray method (USP). In order to observe the effect of Ag doping on ZnO thin films, doping rates of 0.5%, 1%, 2%, 3% and 4% were carried out. Some measurements were taken to investigate the effects of Ag dopant for example Uv–Vis spectroscopy and photoluminesce...
In this study, the reactive radio frequency magnetron sputtering (RFMS) method under varying thickness was used to deposit GeOx on Si substrate at room temperature. The effect of thickness on the structural and optical properties of high-quality germanium dioxide (GeO2) thin films have been investigated by experimental. Structural properties were i...
Samples of new polymeric material based on polypropylene doped with various Tincal concentrations have been developed. The prepared samples are coded PT1, PT2, PT3, and PT4. The structural characteristics of the produced polymeric materials were investigated using X-ray diffraction (XRD) and Raman Spectroscopy. The obtained materials' shielding cap...
In this study, firstly, ZnO thin film was produced on glass substrate by chemical spray pyrolysis method at 450 °C and then Fe2O3 layer was produced on ZnO substrate thin film by RF magnetron sputtering technique. Fe2O3/ZnO heterostructure was fabricated. The crystal structure, surface morphology and structure, chemical composition, optical and ele...
ZnO is one of the main materials used in thin film coating due to its low cost and advantageous properties. The aim of this study is to examine the optical, morphological and structural properties of zinc oxide thin films coated with ultrasonic spray pyrolysis(USP) technique. ZnO thin films were grown at 450°C using different precursor solutions su...
Six alloy samples have been fabricated and introduced as a new gamma-ray shield in this work. These alloys are based mainly on B4C, Cr, Fe, Cu, W, Re, and Ni metals in their structure. S1, S2, S5, S7, S8, and S10 super alloys crystal structure was analyzed via X-ray Diffraction. Shielding applications against gammas have been investigated via MCNP-...
The transition metal doped magnesium ferrite and zinc ferrite as the most common form of iron oxide become an especially important photoanode material for photoelectrochemical water splitting, due to its comparatively small band gap (Eg = 2.0 eV) that can absorb visible light and its perfect chemical stability in watery solutions. Spinel ferrites h...
The magnetic magnesium ferrite (MgFe2O4) with a partially inverse spinel structure has been prepared by the classic ceramic method, which have practical application in information storage systems, magnetocaloric refrigeration and magnetic diagnostics. Nickel-magnesium ferrites (Ni:MgxFe3-xO4 or Mg(1-x)NixFe2O4; 0 ≤ x < 1) are magnetic materials of...
In this study, we, firstly, fabricated Fe 2 O 3 thin film recently promising to be used in spintronic technology by magnetron sputtering technique on ZnO thin film prepared by spray pyrolysis at 450 o C. The crystal structure, surface morphology and structure, chemical composition, optical and electronic properties, and electric properties of the F...
It has been investigated the effect of film thickness on the optical and morphological properties of cadmium oxide (CdO) thin film. For this reason, transparent and conducting CdO thin films were deposited on glass substrates at 200 °C temperature using DC magnetron sputtering method. The power of the sputter in the experiment was set up to 100 W....
In the present work, transparent cadmium oxide (CdO) thin films prepared by using different methods (spray pyrolysis and sol–gel techniques) on the glass substrate. Optical and morphological properties of these films were compared. For this reason, X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and UV–VIS...
Iron oxide semiconductor gas sensors are used in a variety of different applications. They are relatively cheap compared to other sensing technologies and benefit from high material sensitivity, reliable and quick response times. Spray pyrolysis (SP) is one of the solution based coating technique to grow thin or thick films. The technique of SP wit...
In this paper, the p-type GaSe crystal used in this study was obtained by the Bridgman-Stockbarger method. Ohmic contacts for the Hall and magnetoresistance measurements were made by in evaporation in a vacuum of 10-5 Torr. Indium shots located on the evaporated indium dots in contacts were annealed in nitrogen medium at 305 °C for 3 min. The therm...
A few familiar transition metal oxides, have appropriate photoanode for solar-driven photoelectrochemical (PEC) water splitting materials. In particular, iron oxides are cheaper, plenty, n-type semiconductor with a relatively smaller band gap in the visible range compared with other oxides; thus they have been established as a promising candidate f...
Hematite (a-Fe2O3), especially magnesium ferrite (MgxFe3-xO4, 0<x<1) are promising candidate as photoanode materials for solar-to-fuel conversion which unable to emit carbon dioxide. Due to iron oxides favorable band gap for visible light absorption, its relatively low cost in comparison to other expensive materials. However, these materials have s...
In this study, NiCr2O4 thin films were grown with three different oxygen partial pressures using Nickel Oxide (NiO) semiconducting thin films and three different oxygen partial pressures using Radio Frequency RF sputtering technique. The structural and optical properties of NiO and NiCr2O4 films grown at different oxygen pressures have been determi...
In this study, Nickel oxide (NiO) thin films were grown under different oxygen pressures by Radio frequency (RF) sputtering technique. Structural and optical properties of the thin films were investigated and gas sensors were produced on the thin films grown at different oxygen pressures. The X-ray diffraction (XRD) results showed that the films ha...
In this study, Nickel oxide (NiO) thin films were grown under different oxygen pressures by Radio frequency (RF) sputtering technique. Structural and optical properties of the thin films were investigated and gas sensors were produced on the thin films grown at different oxygen pressures. The X-ray diffraction (XRD) results showed that the films ha...
Abstract
Iron oxide thin films have been obtained significant interest as a material that put forwards applications in photovoltaics, gas sensors, biosensors, optoelectronic and especially in spintronics. Iron oxide is one of the considerable interest due to its chemical and thermal stability. Metallic ion dopant influenced superexchange interactio...
NiO thin films were grown by Radio Frequency (RF) Magnetron Sputtering method under different oxygen partial pressures, which are 0.6 mTorr, 1.3 mTorr and 2.0 mTorr. The effects of oxygen partial pressures on the thin films were analyzed through Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), X-ray Photoe...
In this study, quaternary iron oxide compounds with Zn, Ni, Co metal dopants were grown by using Spray Pyrolysis (SP) technique. The structural, optical, electrical and magnetic properties of NixZn1-xFe2O4 (0≤x<0.7) and CoxZn1-xFe2O4 (0≤x<1) compounds have been carefully studied. XRD, XPS, Raman and FE-SEM techniques have been used for structural a...
In this work, Transparent conduction oxide (TCO) films, such as ITO, NiO, Al-doped ZnO (AZO), were deposited on glass substrate by R.F. magnetron sputtering
Co-doped ZnO and Fe-doped ZnO diluted magnetic semiconductor films were prepared on glass substrates by chemical spray pyrolysis (CSP) method. Synthesized ZnO:Co and ZnO:Fe thin films by CSP method were compared to thin film properties. Optical analysis of the synthesized thin films was examined by spectral absorption and transmittance measurements...
Transition metal-doped MgO diluted magnetic thin films are appropriate candidates for spintronic applications and designing magnetic devices and sensors. Therefore, MgO:Co and MgO:Cu films were deposited on glass substrates by Chemical Spray Pyrolysis (CSP) method different thin film deposition parameters. Deposited different transition metal doped...
The present study is focused on the CudopedZnO and NidopedZnO dilute magnetic semiconductor thin films. ZnO:Cu and ZnO:Ni thin films were grown by Chemically Spray Pyrolysis (CSP) method on glass substrates. Optical analysis of the films was done spectral absorption and transmittance measurements by UV-Vis double beam spectrophotometer technique. T...
Erbiumdoped MgO and dopedZnO thin films have reasonably important properties applications in spintronic devices. These films were synthesized on glass substrates by Chemical SprayPyrolysis (CSP) method. In the literature there has been almost no report on preparation of MgO:Er dilute magnetic thin films by means of CSP. Because dopedthin films show...
We have tried to probe into the effect of doping with transition metal Co on both the optic, magnetic, structural
and morphological properties of these dilute magnetic semiconductor. Diluted magnetic semiconductors (DMS) were intensely investigated both experimentally and theoretically in recent years. In spite of large body of studies to have a be...
Abstract
This work describes hematite (a-Fe2O3) and ZnxFe3-XO4 thin films prepared by Chemical Spray Pyrolysis (CSP)
method. CSP method allows an optimal control of stoichiometry and impurity incorporation, hematite films modified
with Zn2+ was also prepared. Moreover, the most attracting characteristics of the hematite are its stability in neutral...
Maghemite (Fe2O3) was synthesized by chemical spray pyrolysis (CSP) method at same substrate temperatures on glass, MgO and ZnO thin films. In this study, first maghemite thin film was grown on glass substrate and structural analysis of maghemite thin film was made by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. MgO an...
Transition metal-doped MgO diluted magnetic thin films are appropriate candidates for spintronic applications and designing magnetic devices and sensors. Therefore, MgO:Co and MgO:Cu films were deposited on glass substrates by Chemical Spray Pyrolysis (CSP) method different thin film deposition parameters.
Spintronik alanında, elektronun yükü ile spinini birleştirerek yeni fonksiyonlara ve artan performansa sahip spin kontrollü vanalar, anahtarlar, transistörler, hafızalar, dedektörler, manyetik sensörler ve lazerler elde etmenin amaçlandığı göz önünde bulundurularak spin kutuplu akımları filtreleyebilecek manyetik malzemeler üretmek önem arz etmekte...
Yarı iletken spintroniğine ilgi 2000’lerin başında seyreltik manyetik yarı iletken kavramı ile ortaya çıkmıştır. Seyreltik manyetik yarı iletken elde etmenin en yaygın yolu yarı iletken malzemeye manyetik geçiş metalleri katkılamaktır. Geçiş metallerinin 3d yörüngelerindeki çiftlenmemiş spinler manyetik davranışın sergilenmesine sebep olurlar. İdea...
We fabricated hematite (α-Fe2O3) thin films by Chemically Spray Pyrolysis (CSP) method on glass substrate. Detailed structural properties of the film have been investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The α-Fe2O3 thin films have been annealed at %20 H2-% 80 N2 atmospheres in three zone furn...