Yazar "Kilinc N." seçeneğine göre listele

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    THE EFFECT OF CRYSTAL STRUCTURE AND METAL ELECTRODES ON GAS DETECTION IN TiO2 NANOTUBES H2 SENSORS
    (International Association for Hydrogen Energy, IAHE, 2022) Tasyurek L.B.; Isik E.; Isik I.; Kilinc N.
    In this study, the effects of various metal electrodes and various crystal structures on hydrogen (H2) gas sensors based on titanium dioxide (TiO2) nanotubes were investigated. For the production of TiO2 nanotubes, anodization method consisting of an electrolyte containing 0.5wt% NH4F in 85% pure glycerol solution was applied. Scanning electron microscope (SEM) images of the obtained TiO2 nanotubes were examined. In order to see the effect of different crystal structures of TiO2, amorphous, anatase and rutile phases were obtained by annealing of samples. Each of the Ti/TiO2 nanotubes/metal (Pd, Pt, Au, and Ag) gas sensors, obtained by coating with palladium (Pd), platinum (Pt), gold (Au) and silver (Ag) electrodes, was tested at room temperature at 1% H2 concentration depending on three different phases. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
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    HYDROGEN SENSING PROPERTIES OF ULTRATHIN Pt-Co ALLOY FILMS
    (International Association for Hydrogen Energy, IAHE, 2022) Erkovan M.; Deger C.; Cardoso S.; Kilinc N.
    In the present work, ultrathin PtxCo1-x (x=1, 0.75, 0.5 and 0.25) alloy films are fabricated using co-sputtering with approximately 2nm in thickness. The stoichiometry and structural characterization of the thin films are obtained from SEM, EDX and XPS measurements. The structural characterization of the thin films showed smooth coverage of the surface, in a fcc crystalline plane (111). The resistive properties of the films are tested towards a hydrogen gas sensor between 25 °C - 150 °C in the gas concentration ranging from 0.5% to 5%. The surface scattering phenomenon could explain the hydrogen gas sensing mechanism of ultrathin PtxCo1-x alloy thin films. PtCo alloy thin films show better response time than bare Pt thin films. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
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    Hydrogen sensors for safety applications
    (Elsevier, 2023) Sisman O.; Erkovan M.; Kilinc N.
    This chapter includes the risks and hazards of hydrogen, the properties and reactivity of hydrogen, hydrogen sensors, the hydrogen sensor market, and future trend in hydrogen sensors. Hydrogen sensors are classified into nine categories depending on the evident physico-chemical principles of the detection mechanism: catalytic, electrochemical, work function-based, resistor-based, mechanical, acoustic, optical, thermal conductivity, and magnetic. © 2024 Elsevier Inc. All rights reserved.
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    Nanostructured Platinum and Platinum Alloy-Based Resistive Hydrogen Sensors: A Review †
    (Multidisciplinary Digital Publishing Institute (MDPI), 2023) Kilinc N.; Erkovan M.
    As a future energy source, hydrogen is used in many industrial applications, such as chemicals, semiconductors, transportation, etc. Hydrogen gas, which has many unusual properties compared to other gases, has the risk of being flammable and explosive when it is present in the atmosphere at concentrations of 4% and higher. We need hydrogen sensors both to determine the risks in advance and because we do not want hydrogen gas, which is a source of energy, to be lost due to leakage. Hydrogen sensors are used in hydrogen production plants to determine hydrogen purity, for leakage and safety in all areas where hydrogen gas is used, and also in the medical field, as hydrogen gas is a marker in disease diagnosis. In the context of classifying hydrogen sensors according to their physicochemical sensing mechanisms, resistive metallic hydrogen sensors stand out as a prevalent choice, with Pd, Pt, and their alloy counterparts being commonly employed as designated sensing materials. In this study, nanostructured platinum (Pt) and Pt alloy-based resistive hydrogen sensors are reviewed and discussed in detail. The sensing mechanism of Pt-based resistive hydrogen sensors has been explained by the scattering of charge carriers at the surface, coupled with its defects and grain boundaries, and by the formation of hydride (PtHx) phenomena, depending on the increase or decrease in resistance in the hydrogen environment. © 2023 by the authors.
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    Room temperature gas and VOCs sensors based on metal oxide composites
    (Elsevier, 2024) Kilinc N.; Sisman O.; Tasaltin C.; Gurol I.
    The continuous operation of metal-oxide semiconductor (MOS)-based gas sensors at high temperatures results in the decreased longevity with large power consumption. In addition, when they heat up to a high temperature, this could lead to changes in the microstructure of the sensing nanomaterials, resulting in the degradation of sensing performance. For this reason, it is important to reduce the operating temperature of MOS-based gas sensors at room temperature (RT) without compromising their sensing performances. This chapter centers on the use of MO-based nanocomposites operating in room temperatures for VOC sensing. © 2024 Elsevier Inc. All rights reserved.
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    The Structural and Electrical Characterization of Europium Sulfide Thin Films Prepared with E-Beam Evaporation †
    (Multidisciplinary Digital Publishing Institute (MDPI), 2023) Tasyurek L.B.; Dörr F.; Erkovan M.; Shokr Y.A.; Kilinc N.; Fumagalli P.
    In this study, EuS thin films with varying thicknesses (15, 25, and 50 nm) were deposited onto a Si/SiO2 substrate using e-beam evaporation. Subsequently, two Ag contact electrodes with a 0.2 mm spacing were prepared via thermal evaporation using a shadow mask. To investigate the influence of film thickness and temperature on the electrical properties of EuS thin films, current-voltage (I–V) measurements were performed in a temperature range of 300–433 K for a voltage range of ?2 V to +2 V. The I–V characteristics exhibited a temperature-dependent behavior, particularly showing an increase in current with rising temperature in the forward bias region. Furthermore, an improvement in the Schottky behavior was observed with increasing EuS film thickness. Additionally, the AC electrical and dielectric properties of the EuS thin film were examined in a frequency range of 4 Hz–8 MHz. Capacitance, conductance, impedance, and the Cole–Cole characteristic of EuS were analyzed in detail with respect to frequency, temperature, and film thicknesses. © 2023 by the authors.