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    Wyświetlanie 1-8 z 8
    Tytuł:
    Raman Studies of ZnO Products Synthesized by Solution Based Methods
    Autorzy:
    Gültekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398789.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Fs
    81.07.Bc
    81.07.-b
    81.20.Fw
    Opis:
    In this study, nanostructured ZnO thin film coatings produced by sol-gel method have been examined and characterized. ZnO thin film coatings synthesized by the preparation of ZnO sols in the liquid phase from homogeneous solutions with precursor of zinc acetate dihydrate (Zn(CH₃COO)₂·2H₂O). Ethanol (C₂H₅OH) has been used as a solvent material and monoethanolamine (MEA) has been used as a complexing agent. The final solutions have 0.1, 0.3, 0.5, 0.7 and 1 molar concentrations. General morphologies and detailed structural characterizations have been obtained by using scanning electron microscope (SEM). Qualitative analyses of the synthesized coatings were performed using X-ray diffraction (XRD) and Raman spectroscopy. The Raman spectroscopy studies of precursor, solution and final products were carried out to investigate transformation of the chemical compounds from the initial material to the final coating.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 803-805
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructured ZnO Photoelectrode Synthesis for Dye Sensitized Solar Cells
    Autorzy:
    Gültekin, D.
    Alaf, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182877.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    61.46.Df
    81.07.Wx
    81.20.Fw
    88.40.jm
    Opis:
    The main aims of this work were to produce and examine the characteristics of nanostructured ZnO in dye-sensitized solar cells. Parameters which are affected by the efficiency such as precursor materials, morphology were investigated. The Raman spectroscopy was used to investigate transformation from bulk material to solution. General morphologies and detailed structural characterizations were obtained using field emission scanning electron microscopy. X-ray diffractometer has been used to determine preferred crystal orientation and particle size of the ZnO nanostructures.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 301-303
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of ZnO Nanopowders and ZnO-CNT Nanocomposites Prepared by Chemical Precipitation Route
    Autorzy:
    Gültekin, D.
    Alaf, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399778.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    81.07.Wx
    81.05.Dz
    61.48.De
    81.20.Fw
    Opis:
    The aims of this work are synthesis of ZnO nanopowders and producing nanocomposites by mixing with carbon nanotubes. ZnO nanopowders have been synthesized by chemical precipitation route. Different amount of collected nanosized Zn-based precipitates and chemically oxidized carbon nanotubes powder have been mix together and annealed at 400°C. Characterization of produced nanopowders and nanocomposites have been carried out by X-ray diffractometer and scanning electron microscope.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 274-276
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of pH Value on the Growth and Structural Properties of Sol-Gel Synthesized Nanostructured ZnO
    Autorzy:
    Gültekin, D.
    Alaf, M.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399831.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    81.07.Wx
    81.20.Fw
    Opis:
    The aim of the research presented is to investigate the effect of pH value on the structural and morphological properties of nanostructured ZnO products. Zinc acetate dihydrate $(Zn(CH_3COO)_2·2H_2O)$ has been used as precursor whereas distilled water is used as a solvent. The pH value of the sol was adjusted with monoethanolamine (MEA) and it changed from acid to base in nature. X-ray diffractometer has been used to determine preferred crystal orientation and particle size of the thin films. Film morphologies have been examined by using JEOL JSM 6060 LV scanning electron microscope equipped with energy-dispersive spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 330-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Approach to Synthesis of Free-Standing ZnO/MWCNT Nanocomposites by Vacuum Infiltration
    Autorzy:
    Alaf, M.
    Gultekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287896.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.uj
    61.48.De
    78.30.Fs
    Opis:
    In this study, free-standing zincoxide/multiwalled carbon nanotube nanocomposite was synthesized by a multistep technique. Buckypapers having controlled porosity were prepared by vacuum filtration from oxidized multiwalled carbon nanotubes. Zinc acetate dihydrate (ZnAc) ($Zn(CH_3COO)_2$ ·$2H_2O$) was used as zinc source and ethanol used as solvent. An appropriate amount of monoethanolamine was added to sol to change acid-base media. The solution was vacuum filtered through buckypaper and annealed at 350C in air. It was found that the zinc oxide grows around the multiwalled carbon nanotubes to form a uniform composite. Morphology of zine oxide/multiwalled carbon nanotube was also studied in detail. Nanocomposite was characterized by X-ray diffraction, scanning electron microscopy, and Raman spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 426-428
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Substrate Temperature on Structural Properties of Tin Oxide Films Produced by Plasma Oxidation after Thermal Evaporation
    Autorzy:
    Alaf, M.
    Guler, M.
    Gultekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399830.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.fm
    73.61.At
    81.16.Pr
    Opis:
    In this study, tin film was thermally evaporated onto a stainless steel substrate in an argon atmosphere. The tin films were then subjected to a DC plasma oxidation process using an oxygen/argon gas mixture. Three different substrate temperatures (100°C, 150°C, and 200°C) and three different oxygen partial pressures (12.5%, 25%, and 50%) were used to investigate the physical and microstructural properties of the films. The surface properties were studied by scanning electron microscopy, X-ray diffraction, atomic force microscopy and a four-point probe electrical resistivity measurement. The grain size and texture coefficient of the tin oxide films were calculated. Both SnO and $SnO_2$ films with grain sizes of 13-43 nm were produced, depending on the oxygen partial pressure. SnO films have flower- and flake-like nanostructures, and $SnO_2$ films have grape-like structures with nanograins. The resistivity values for the $SnO_2$ phase were found to be as low as $10^{-5}$ Ω cm and were observed to decrease with increasing substrate temperature.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 326-329
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Superior Surface Discharge Capacity of Core-Shell Tinoxide/Multi Walled Carbon Nanotube Nanocomposite Anodes for Li-Ion Batteries
    Autorzy:
    Akbulut, H.
    Alaf, M.
    Gultekin, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1218746.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.uj
    61.48.De
    82.47.Aa
    82.80.Fk
    Opis:
    In this study, tin/tinoxide/multiwalled carbon nanotube (Sn/$SnO_2$/MWCNT) nanocomposites were produced as anode materials for Li-ion batteries by a two-step process. Metallic tin was evaporated onto free-standing MWCNT buckypapers having controlled porosity and subsequently rf plasma oxidized in Ar:$O_2$ (1:1) gas mixture. Besides, Sn/$SnO_2$ nanocomposites were produced in the same conditions onto stainless steel substrates to make a comparison. X-ray diffraction and scanning electron microscopy were used to determine the structure and morphology of the obtained nanocomposites. The discharge/charge tests, cyclic voltammetry and electrochemical impedance spectroscopy were carried out to characterize the electrochemical properties of these composites. Promising results were obtained in the tin based MWCNT nanocomposites for next-generation micro battery applications because of the high active surface area of the $SnO_2$/MWCNT core-shell structures.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 335-337
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tin/Tinoxide $(Sn//SnO_2)$ Nanocomposites Thin Films as Negative-Electrode Materials for Li-Ion Batteries
    Autorzy:
    Alaf, M.
    Gultekin, D.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399828.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.fm
    73.61.At
    81.16.Pr
    82.47.Aa
    78.67.Sc
    Opis:
    In this study, tin/tinoxide $(Sn//SnO_2)$ nanocomposites thin films were produced by thermal evaporation and plasma oxidation as anode materials for Li-ion batteries. To produce $Sn//SnO_2$ thin films, pure metallic tin (Sn) was thermally evaporated on the stainless steel substrates in argon atmosphere. The Sn films were subjected to plasma oxidation process at oxygen/argon gas mixture. Three different plasma oxidation times (30, 45, and 60 min) were used to investigate oxidation kinetics and physical and microstructural properties. The surface properties were studied by scanning electron microscopy and atomic force microscopy. For structural analysis, X-ray diffraction measurements were carried out. $Sn//SnO_2$ coated stainless steel substrates were used as the working electrode in coin-type (CR2016) test cells. The energy storage capacity $Sn//SnO_2$ electrodes were determined depending on the oxidation time and $Sn:SnO_2$ ratio.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 323-325
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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