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    Wyświetlanie 1-22 z 22
    Tytuł:
    Epitaxial ZnO Films Grown at Low Temperature for Novel Electronic Application
    Autorzy:
    Wachnicki, Ł.
    Dużyńska, A.
    Domagala, J.
    Witkowski, B.
    Krajewski, T.
    Przeździecka, E.
    Guziewicz, M.
    Wierzbicka, A.
    Kopalko, K.
    Figge, S.
    Hommel, D.
    Godlewski, M.
    Guziewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492723.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    61.05.cp
    81.05.Dz
    Opis:
    Monocrystalline films of zinc oxide were grown at 300C by atomic layer deposition. ZnO layers were grown on various substrates like ZnO bulk crystal, GaN, SiC and $Al_2O_3$. Electrical properties of the films depend on structural quality. Structural quality, surface morphology and optical properties of ZnO films were characterized using X-ray diffraction, scanning electron microscopy, and photoluminescence, respectively. High resolution X-ray diffraction spectra show that the rocking curve FWHM of the symmetrical 00.2 reflection equals to 0.058° and 0.009° for ZnO deposited on a gallium nitride template and a zinc oxide substrate, respectively. In low temperature photoluminescence sharp excitonic lines in the band-edge region with a FWHM equal to 4 meV, 5 meV and 6 meV, for zinc oxide deposited on gallium nitride, zinc oxide and sapphire substrate, respectively.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-007-A-010
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the In-Plane Epitaxial Mismatch between the Substrate and the Film on the Properties of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ Films
    Autorzy:
    Abal'osheva, I. S.
    Cieplak, M. Z.
    Adamus, Z.
    Berkowski, M.
    Domukhovski, V.
    Aleszkiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046741.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    74.25.Sv
    81.15.Aa
    Opis:
    We study the effect of the in-plane epitaxial mismatch between the substrate and the film on the crystallographic structure and the transport properties of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ superconducting films of thicknesses ranging between 600 and 3000Å. The films are grown by pulsed laser deposition on the new type of single-crystalline substrates prepared by Czochralski method, with the chemical formula (SrAl$\text{}_{0.5}$Ta$\text{}_{0.5}$O$\text{}_{3}$)$\text{}_{0.7}$(CaAl$\text{}_{0.5}$Ta$\text{}_{0.5}$O$\text{}_{3}$)$\text{}_{0 .1}$(LaAlO$\text{}_{3}$)$\text{}_{0.2}$. We find that superconducting properties of the samples are excellent, and generally they improve with increasing of the film thickness as a result of improved structural ordering. We also investigate the influence of the film thickness on the behavior of the critical current densities.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 549-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Structural and Optical Properties of Mo-Doped ZnO Thin Films
    Autorzy:
    Mekki, A.
    Tabet, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1219233.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    78.20.-e
    61.05.cp
    61.05.cj
    Opis:
    Transparent zinc oxide thin films doped with molybdenum have been prepared using a DC reactive magnetron sputtering on glass substrates from metallic ZnMo target. The three films, called A, B, and C, had 1.9 at.% Mo, 2.8 at.% Mo and 4.7 at.% Mo, respectively. The composition of the films was determined by X-ray photoelectron spectroscopy. The analysis of Mo 3 $d_{5/2}$ core level spectra indicated that Mo exist in the films in $Mo^{6+}$ oxidation state irrespective of the Mo content in the film. The X-ray diffraction spectrum of film A showed a texture along the 002 orientation, while that of film B showed two peaks, one at $θ ≈ 34.5°$ and the other at $≈ 36.5°$ corresponding to 002 and 101 orientations, respectively. Film C showed two small peaks corresponding to 100 and 110 orientations. Optical measurements showed that all three films had a transmittance of about 80%. The energy band gap showed a linear increase as Mo concentration increases from 3.29 eV to 3.38 eV. The atomic force microscopy image of film A showed a homogeneous morphology of the surface of the film, while the atomic force microscopy images of films B and C showed an inhomogeneous one.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 365-367
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Structural Characterization of Zinc Oxide Nanostructures Obtained by Atomic Layer Deposition Method
    Autorzy:
    Wachnicki, Ł.
    Witkowski, B.
    Gierałtowska, S.
    Kopalko, K.
    Godlewski, M.
    Guziewicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492916.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    82.47.Rs
    68.55.-a
    81.15.Aa
    Opis:
    Zinc oxide is a II-VI semiconductor material which is gaining increasing interest in various fields such as biology, medicine or electronics. This semiconductor reveals very special physical and chemical properties, which imply many applications including a transparent electrode in solar cells or LED diodes. Among many applications, ZnO is also a prospective material for sensor technology, where developed surface morphology is very advantageous. In this work we present ZnO nanowires growth using atomic layer deposition method. ZnO nanowires were obtained using controlled physical properties. As a substrate we used gallium arsenide with gold-gallium eutectic droplets prepared on the surface at high temperature. To obtain the eutectic solution there was put a gold thin film on GaAs through the sputtering and then we annealed the sample in a nitrogen gas flow. The so-prepared substrate was applied for growth of ZnO nanowires. We used deionized water and zinc chloride as oxygen and zinc precursors, respectively. The eutectic mixture serves as a catalyst for the ZnO nanowires growth. Au-Ga droplets flow on the front of ZnO nanowires. Scanning electron microscopy images show ZnO nanorods in a form of crystallites of up to 1 μm length and a 100 nm diameter. It is the first demonstration of the ZnO nanowires growth by atomic layer deposition using the vapour-liquid-solid approach.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 905-907
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the Boronizing Kinetics in AISI 316 Stainless Steel
    Autorzy:
    Nait Abdellah, Z.
    Keddam, M.
    Elias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419004.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    This work deals with the simulation of the growth kinetics of the $(FeB//Fe_2B)$ bilayer and the diffusion zone on a substrate of AISI 316 stainless steel exposed to the powder-pack boriding process, in the temperature range of 1123-1273 K and a time duration ranging from 2 to 10 h. The developed diffusion model employs a set of mass balance equations at the three growth fronts: [$(FeB//Fe_2B),$ (FeB/diffusion zone) and (diffusion zone/substrate)] under certain assumptions, including the effect of the incubation times during the formation of iron borides and the diffusion zone. For this purpose, a computer code written in Matlab (version 6.5) was created to simulate the boriding kinetics. A good concordance was obtained when comparing the experimental parabolic growth constants taken from the literature and the simulated values of the parabolic growth constants: ($k_{FeB},$ $k_1$ and $k_2$). Moreover, the present model was also used to predict the thicknesses of the $FeB$ and $Fe_2B$ layers and the diffusion zone thickness at various treatment times and boriding temperatures. The simulated values were in good agreement with the experimental borided layers thicknesses.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 588-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Structure Densification in $TiO_2$ Coatings Prepared by Magnetron Sputtering under Low Pressure of Oxygen Plasma Discharge
    Autorzy:
    Domaradzki, J.
    Kaczmarek, D.
    Prociow, E.
    Radzimski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503889.pdf
    Data publikacji:
    2011-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Cd
    81.15.-z
    68.55.-a
    81.15.Aa
    Opis:
    Current work presents results of studies on structural and optical properties of the $TiO_2$ thin films prepared by reactive magnetron sputtering. Oxide thin films were deposited from metallic targets using oxygen gas only instead of usually used mixture of Ar-$O_2$. Additionally, an increased amplitude of unipolar pulses powering the magnetron has been applied. It is shown that all prepared coatings were stoichiometric and by changing only the discharge voltage it is possible to influence the resulting structural phase and optical properties of prepared thin films. Depending on conditions of magnetron powering, $TiO_2$ thin films had either the anatase structure with refraction index n = 2.1 (λ = 500 nm) or a high temperature stable rutile structure with n = 2.52 (λ = 500 nm).
    Źródło:
    Acta Physica Polonica A; 2011, 120, 1; 49-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Annealed (0001) α-$Al_2O_3$ Surfaces on Heteroepitaxial Growth of Silver Nanoparticles
    Autorzy:
    Al-Mohammad, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808108.pdf
    Data publikacji:
    2009-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    81.15.Aa
    61.05.jh
    61.46.Df
    Opis:
    The effect of annealed (0001) α -$Al_2O_3$ surfaces on heteroepitaxial growth of silver nanoparticles were analysed by reflection high-energy electron diffraction, transmission electron microscope and selected area electron diffraction. Ag nanoparticles were deposited on 1× 1 stoichiometric and reconstructed (111)Al//(0001) α -$Al_2O_3$ with the Knudsen cell. The maximum cluster density method and the Lifethenz theory of Van der Waals energy were used to investigate the Ag//(0001)α -$Al_2O_3$ interface parameters. The growth modes, lattice parameters, nanoparticle forms and sizes are strongly dependent on the substrate surface structures. Initially, three-dimensional islands of Ag nanoparticles grow on both kinds of surfaces with partial hexagonal shapes. Ag nanoparticles on stoichiometric surface create the (111)Ag//(0001)α -$Al_2O_3$ interface without any preferred epitaxial direction. On this surface, Gaussian distribution is characteristic of an atom-by-atom growth mode with density of Ag nanoparticles lower than saturation density while a coalescence growth mode appears due to binary collisions between Ag nanoparticles accompanied by a liquid-like behaviour after saturation density. In case of reconstruction substrates, the epitaxial relationships between Ag nanoparticles and the surface are formed (111)Ag//(0001)α -$Al_2O_3$, 〈01\bar(1)〉Ag//[12\bar(3)0]α -$Al_2O_3$ or 〈01\bar(1)〉Ag//[1\bar(1)00]α-$Al_2O_3$. The Ag nanoparticles make rotation with angles between ± 6° around the epitaxial orientations 〈1\bar(1)00〉 or 〈12\bar(3)0〉. Only the atom-by-atom growth mode were found at all Ag nanoparticles growth processes.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 3; 679-684
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Diffusion Model for the Fe_{2}B Layers Formed on a Ductile Cast Iron
    Autorzy:
    Keddam, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398194.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    In this work, a diffusion model was applied to estimate the boron diffusion coefficients in the $Fe_{2}B$ layers on the ASTM A-536 ductile iron in the temperature range 1173-1273 K by the powder-pack boriding. The mass balance equation at the ($Fe_{2}B$/substrate) interface was formulated considering the effect of boride incubation times. As a result, the value of activation energy for boron diffusion in the ductile iron was estimated and compared with the literature. To verify the validity of the present model, the experimental $Fe_{2}B$ layer thickness obtained at 1173 K for 10 h was compared to the predicted value. A good concordance was observed between the predicted value of $Fe_{2}B$ layer thickness and the experimental data.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1174-1177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Ag Film Roughening during Deposition on Quasicrystal and Approximant Surfaces
    Autorzy:
    Ünal, B.
    Evans, J.
    Thiel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373681.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    61.44.Br
    68.37.Ef
    81.15.Aa
    Opis:
    The temperature (T) dependence of roughening as assessed by scanning tunneling microscopy is compared for growth of Ag films on an 5-fold icosahedral Al-Pd-Mn quasicrystal surface and on an ξ'-approximant. Growth on the quasicrystal corresponds to a version of the Volmer-Weber growth, but modified by quantum size effects, and also by kinetic smoothening at low T and low coverages (θ). Growth on the approximant corresponds to a version of the Stranski-Krastanov growth modified by kinetic roughening at low T and low θ. For larger θ, i.e., for thicker films, distinct behavior is observed.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 608-612
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel
    Autorzy:
    Keddam, M.
    Nait Abdellah, Z.
    Kulka, M.
    Chegroune, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402143.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Aa
    68.55.A-
    68.47.De
    68.55.jd
    Opis:
    In the present work, a diffusion model was applied to estimate the boron diffusion coefficients in the FeB and Fe₂B layers during the pack-boriding of AISI D2 steel in the temperature range of 1223-1323 K during a variable exposure time between 1 and 8 h. The mass balance equations were formulated at each growing interface by considering the effect of boride incubation times. The estimated values of boron activation energies in the FeB and Fe₂B layers were compared with the literature data. Validation of the present model was made by comparing the experimental thickness of each boride layer, taken from the literature data, with the predicted values. In addition, a simple equation was suggested to estimate the required time to obtain a single Fe₂B layer by diffusion annealing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 740-745
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Characteristics and Optical Properties of Thermally Oxidized Zinc Films
    Autorzy:
    Rusu, D.
    Rusu, G.
    Luca, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505094.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.hf
    68.55.-a
    68.55.J-
    81.15.Aa
    78.20.-e
    Opis:
    Zinc oxide (ZnO) thin films (with thickness ranged from 780 nm to 1150 nm) were prepared by thermal oxidation in air (at 600-700 K, for 20-30 min) of vacuum evaporated metallic zinc films. The Zn films were deposited on glass substrates at room temperature. The crystalline structure of ZnO thin film samples was investigated using X-ray diffraction technique. The diffraction patterns revealed that the ZnO thin films were polycrystalline and have a wurtzite (hexagonal) structure. The film crystallites are preferentially oriented with (002) planes parallel to substrate surface. Some important structural parameters (lattice parameters of the hexagonal cell, crystallite size, Zn-O bond length, residual stress, etc.) of the films were determined. The surface morphology of the prepared ZnO thin films, investigated by atomic force microscopy, revealed a uniform columnar structure. The spectral dependence of transmission coefficient has been studied in the wavelength range from 300 nm to 1700 nm. The optical energy band gap calculated from the absorption spectra (supposing allowed direct band-to-band transitions) are in the range 3.17-3.19 eV. The dependence of the microstructural and optical characteristics on the preparation conditions (oxidation temperature, oxidation time, etc.) of the oxidized zinc films is discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6; 850-856
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Ca Content on the Structure and Properties οf (Co,Ca)O Thin Films Deposited by PLD Technique
    Autorzy:
    Cieniek, L.
    Kac, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537944.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Fg
    81.15.-z
    81.15.Aa
    68.55.-a
    68.60.Bs
    68.37.-d
    68.55.jd
    Opis:
    In this paper the results of investigations of pure and Ca-doped CoO thin films deposited by PLD technique are presented. The studies carried out for variable Ca content allowed to establish optimal conditions for good quality oxide films preparation. The microstructure, chemical/phase composition and morphology of obtained thin films were examined by means of diverse techniques (SEM, EDS, XPS and XRD). For estimation of deposited Ca-doped CoO films quality the nanohardness and scratch tests (adhesion) were performed. Obtained results confirm that using PLD technique it is possible to carry stoichiometric composition of (Co,Ca)O from target to single crystal substrate and allow to conclude that the calcium dopant concentration (chemical composition) influence on the morphology and measured properties of deposited (Co,Ca)O films.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 803-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Tin Oxide Based Nanocomposites for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Cetinkaya, T.
    Tocoglu, U.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399889.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.30.rh
    81.05.Dz
    81.15.Cd
    82.47.Aa
    Opis:
    In this work, tin oxide ($SnO_2$) films were deposited on multiwall carbon nanotube buckypaper using a rf magnetron sputter process in a mixed oxygen/argon (1/9) gas environment. Conditions for the growth of $SnO_2$ thin films on multiwall carbon nanotube buckypaper by rf sputtering are: target composition $SnO_2$ (99.999 wt%); total system pressure 1 Pa; sputtering power (rf) 75, 100 and 125 W, respectively; $O_2//Ar$ (1/9) gas mixture. The surface morphology of the $SnO_2$ multiwall carbon nanotube composite films was investigated by scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The electrochemical properties of $SnO_2$ multiwall carbon nanotube composite anodes were investigated by galvanostatic charge-discharge experiments.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 358-360
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Electrochemical Performance of ZnO Films as Anode Materials for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Cetinkaya, T.
    Tocoglu, U.
    Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399886.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.15.Cd
    82.47.Aa
    Opis:
    In this work, the effect of rf power on the structural, electrical and electrochemical properties of ZnO thin films was investigated. ZnO thin films were deposited on glass and Cr coated stainless steel substrates by rf magnetron sputtering in pure Ar gas environment. ZnO thin films for different rf powers (75, 100, and 125 W) were deposited keeping all other deposition parameters fixed. ZnO thin films were used as negative electrode materials for lithium-ion batteries, whose charge-discharge properties, cyclic voltammetry and cycle performance were examined. A high initial discharge capacity about 908 mAh g^{-1} was observed at a 0.5 C rate between 0.05 and 2.5 V. The crystallographic structure of the sample was determined by X-ray diffraction. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thickness of the ZnO thin films was measured using a profilometer.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 355-357
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries
    Autorzy:
    Akbulut, A.
    Cetinkaya, T.
    Guler, M.
    Uysal, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401245.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.20.Fw
    81.15.-z
    Opis:
    In this study, $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were produced via a facile sol-gel method at 800°C. The surfaces of the $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn₂O₄ powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge- discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis confirmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1019-1022
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Performance of Pulse Electrodeposited Sn-Ni/MWCNT Composite Anode for Lithium-Ion Batteries
    Autorzy:
    Uysal, M.
    Görmüş, H.
    Karslıoğlu, R.
    Alp, A.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218848.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    82.47.Aa
    81.05.Mh
    Opis:
    Grain size, and MWCNT content in the electrolyte of nanocrystalline Sn-Ni/MWCNT composite deposits produced from a solution containing nickel chloride and tin chloride at constant electrodeposition conditions (pulse on-time $T_{on}$ at 2.5 ms and pulse off-time $T_{off}$ at 7.5 ms) but with different peak current densities were investigated. The structure of the electroplated thin film Sn-Ni/MWCNTs composite electrode is investigated by X-ray diffraction, scanning electron microscopy. Galvanostatic charge/discharge measurements were performed in the assembled CR2016 cells designed by using anode composite material produced by pulse electro co-deposition. These cells discharge capacities were cyclically tested by a battery tester at a constant current in voltage range between 0.02 and 1.5 V. The electrochemical results showed that the increase in the discharge capacity of the assembled cell was produced when compared with conventionally used graphite lithium-ion batteries.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 353-356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Performance of SnO₂ and SnO₂/MWCNT/Graphene Composite Anodes for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032560.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uj
    81.15.Cd
    82.47.Aa
    Opis:
    In this study, tin oxide (SnO₂) coatings on Cr coated stainless steel and multi-walled carbon nanotube (MWCNT)/graphene substrates were prepared using a radio frequency magnetron sputtering process as anode materials in lithium-ion batteries. SnO₂ thin film and SnO₂/MWCNT/graphene composite were characterized with field-emission scanning electron microscopy, X-ray diffraction, and electrochemical tests (cyclic voltammetry and galvanostatic cycling). The electrochemical properties of SnO₂ and SnO₂/MWCNT/graphene composite anodes were studied using 2016-type coin cells assembled in an argon-filled glove box. The cells were cyclically tested on a MTI BST8-MA battery analyzer. The cyclic voltammograms of SnO₂ anode and SnO₂/MWCNT/graphene composite anode were obtained over the potential range of 0.05-3.0 V and 0.05-2.5 V at a scan rate of 0.05 mV s¯¹, respectively.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 204-206
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructured ATO Anodes Produced by RF Magnetron Sputtering for Li-Ion Batteries
    Autorzy:
    Cevher, O.
    Tocoglu, U.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401282.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uj
    81.15.Cd
    82.47.Aa
    Opis:
    In this study, the reversible capacities, as well as the cycling behavior, of crystalline antimony-doped tin oxide (ATO) films have been investigated. ATO films were deposited on Cr-coated stainless steel substrates by the RF magnetron sputtering technique, with antimony-doped tin oxide (SnO₂:Sb) target in a mixed oxygen/argon gas environment. The ATO films were deposited for 1.0 h in a mixture of Ar and O₂ environment with O₂/Ar ratio of 10/90, at sputtering power of 75 W, 100 W and 125 W RF. ATO films were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM). The electrochemical properties of ATO anodes were studied using 2016-type coin cells assembled in an argon-filled glove box.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1065-1067
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructured Silicon Thin Film Electrodes for Li-Ion Batteries
    Autorzy:
    Tocoglu, U.
    Cetinkaya, T.
    Cevher, O.
    Oguz Guler, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399941.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uf
    81.15.Cd
    82.47.Aa
    Opis:
    In this study we produced nanostructured silicon thin films as lithium ion battery electrodes. Films were sputtered onto stainless steel substrates from high purity silicon target via dc magnetron sputtering technique with using different powers. Morphology and crystal structure of films were characterized with the use of scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy analysis, respectively. The thickness of films was measured by using surface profiler. Coin type test cells were assembled in argon filled glove box. Electrochemical performance of cells was tested on an electrochemical analyzer using constant current densities over a voltage range of 0.2-2 V.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 380-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyclic Performance Tests of Si/MWCNT Composite Lithium Ion Battery Anodes at Different Temperatures
    Autorzy:
    Tocoglu, U.
    Cevher, O.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192560.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.55.df
    81.15.Cd
    82.47.Aa
    78.67.Sc
    61.48.De
    Opis:
    In this study silicon-multi walled carbon nanotube (Si-MWCNT) lithium ion battery anodes were produced and their electrochemical galvanostatic charge/discharge tests were conducted at various (25°C, 35°C, 50°C) temperatures to determine the cyclic behaviors of anode at different temperatures. Anodes were produced via vacuum filtration and DC magnetron sputtering technique. Silicon was sputtered onto buckypapers to form composite structure of anodes. SEM analysis was conducted to determine morphology of buckypapers and Si-MWCNT composite anodes. Structural and phase analyses were conducted via X-ray diffraction and Raman Spectroscopy technique. CR2016 coin cells were assembled for electrochemical tests. Cyclic voltammetry test were carried out to determine the reversibility of reactions between anodes and reference electrode between 0.01-2.0 V potential window. Galvanostatic charge/discharge tests were performed to determine cycle performance of anodes at different temperatures.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1059-1061
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating
    Autorzy:
    Uysal, M.
    Cetinkaya, T.
    Gul, H.
    Kartal, M.
    Algul, H.
    Tokur, M.
    Alp, A.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401294.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.15.-z
    73.61.At
    Opis:
    In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1106-1108
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Electrochemical Properties of Cu Coated $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ Nanocomposites for High Rate Li-Ion Batteries
    Autorzy:
    Algul, H.
    Erdas, A.
    Tokur, M.
    Guler, M.
    Akbulut, H.
    Alp, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401278.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.15.-z
    88.80.ff
    Opis:
    Several reported problems of commercial LiCoO₂ electrode materials such as high cost, toxicity, limited rate capability and safety concerns are still remain to be problematic to develop the lithium ion consumer electronics such as mobile phones, tablets and notebook computers. In this study, an alternative nanocomposite electrode material based on $LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ and copper coated one were produced via a facile sol-gel method and electroless Cu deposition techniques. The resulting samples were characterized by X-ray diffraction (Rigaku DMax 2200 diffractometer) using a monochromatized Cu-Kα source (λ=1.5406 Å) and 2θ scan range from 10° to 80° with a speed of 1° $\text{min}^{-1}$. The scanning electron microscope (SEM) was used in order to characterize the morphology of the active materials. The as-synthesized $Cu//LiCr_{0.2}V_{0.2}Mn_{0.6}O_2$ composite cathode exhibits a stable capacity on cycling and good rate capability after 50 cycles and total capacity retention of 93% is obtained. The unique 2D structure of the composite cathode material, its good electrochemical performances and its relatively low cost comparing to LiCoO₂, make this material very promising for applications.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1038-1041
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-22 z 22

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