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    Wyświetlanie 1-6 z 6
    Tytuł:
    Optical and electrical properties of (Ti-V)Ox thin film as n-type Transparent Oxide Semiconductor
    Autorzy:
    Mazur, M.
    Domaradzki, J.
    Wojcieszak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/201406.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Transparent Oxide Semiconductor
    Transparent Electronics
    (Ti-V)Ox thin film
    magnetron sputtering
    optical and electrical properties
    Opis:
    In this paper, the influence of vanadium doping on optical and electrical properties of titanium dioxide thin films has been discussed. The (Ti-V)Ox thin films was deposited on silicon and Corning glass substrates using high energy reactive magnetron sputtering process. Measurements performed with the aid of x-ray diffraction revealed, that deposited thin film was composed of nanocrystalline mixture of TiO2-anatase, V2O3 and β-V2O5 phases. The amount of vanadium in the thin film, estimated on the basis of energy dispersive spectroscopy measurement, was equal to 3 at. %. Optical properties were evaluated based on transmission and reflection measurements. (Ti-V)Ox thin film was well transparent and the absorption edge was shifted by only 11 nm towards longer wavelengths in comparison to undoped TiO2. Electrical measurements revealed, that investigated thin film was transparent oxide semiconductors with n-type electrical conduction and resistivity of about 2.7 · 105 Ωcm at room temperature. Additionally, measured I-V characteristics of TOS-Si heterostructure were nonlinear and asymmetrical.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 583-594
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of nanocrystalline structure and surface properties of TiO2 thin films on the viability of L929 cells
    Autorzy:
    Osękowska, M.
    Karuga-Kuźniewska, E.
    Wojcieszak, D.
    Mazur, M.
    Poniedziałek, A.
    Kaczmarek, D.
    Szymonowicz, M.
    Rybak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778951.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TiO2
    surface properties
    nanocrystalline thin film
    cell morphology
    viability of L929 cells
    Opis:
    In this work the physicochemical and biological properties of nanocrystalline TiO2 thin films were investigated. Thin films were prepared by magnetron sputtering method. Their properties were examined by X-ray diffraction, photoelectron spectroscopy, atomic force microscopy, optical transmission method and optical profiler. Moreover, surface wettability and scratch resistance were determined. It was found that as-deposited coatings were nanocrystalline and had TiO2-anatase structure, built from crystallites in size of 24 nm. The surface of the films was homogenous, composed of closely packed grains and hydrophilic. Due to nanocrystalline structure thin films exhibited good scratch resistance. The results were correlated to the biological activity (in vitro) of thin films. Morphological changes of mouse fibroblasts (L929 cell line) after contact with the surface of TiO2 films were evaluated with the use of a contrast-phase microscope, while their viability was tested by MTT colorimetric assay. The viability of cell line upon contact with the surface of nanocrystalline TiO2 film was comparable to the control sample. L929 cells had homogenous cytoplasm and were forming a confluent monofilm, while lysis and inhibition of cell growth was not observed. Moreover, the viability in contact with surface of examined films was high. This confirms non-cytotoxic effect of TiO2 film surface on mouse fibroblasts.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 33-39
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Optical Response of Gasochromic Thin Film Structures through Modelling of Their Transmission Spectra under Presence of Organic Vapor
    Autorzy:
    Domaradzki, J.
    Mazur, M.
    Wojcieszak, D.
    Kaczmarek, D.
    Jedrzejak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189782.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    Opis:
    Properties of chromogenics materials have been of great interest for more than 50 years till now. Some examples of their practical application are photochromic lenses, electrochromic smart windows or even some examples of sensors devices based on gasochromic thin films have already been commercially available on the market. However, recognition of different physical and chemical processes that influence the optical response of such materials under changes in surrounding atmosphere is still an open subject for discussion. This work presents results of experimental and theoretical investigations of optical response of the two selected gasochromic (Ti-V-Ta-W)Ox and (Ti-V-Ta-Nb)Ox oxide thin films under ethanol vapor stimulations. Based on the measured experimental transmission spectra, the complex refraction index characteristics were plotted using optical models elaborated for the VIS-NIR spectral range. The models were further used for the prediction of optical responses of optical gas sensing structures with observed gasochromic behavior.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1702-1705
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gasochromic Effect in Nanocrystalline $TiO_{2}$ Thin Films Doped with Ta and Pd
    Autorzy:
    Domaradzki, J.
    Prociow, E.
    Kaczmarek, D.
    Wojcieszak, D.
    Gatner, D.
    Lapinski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807540.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.-h
    68.47.Gh
    78.20.Ek
    Opis:
    In this work gasochromic effect in $TiO_{2}$ thin films doped with palladium and tantalum (without catalyst film) have been described. The results have shown that in nanocrystalline $TiO_{2}$:(Ta, Pd), with anatase structure, the film colorization effect in alcohol presence was observed. Both colorization and also bleaching effect were stable and thermally activated.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-126-S-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytic properties of transparent TiO2 coatings doped with neodymium
    Autorzy:
    Wojcieszak, D.
    Kaczmarek, D.
    Domaradzki, J.
    Mazur, M.
    Morawski, A. W.
    Janus, M.
    Prociów, E.
    Gemmellaro, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779161.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TiO2
    neodymium
    photocatalysis
    wettability
    surface properties
    Opis:
    In this work photocatalytic properties of TiO2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO2-rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 1-7
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the structural and surface properties on photocatalytic activity of TiO2:Nd thin films
    Autorzy:
    Wojcieszak, D.
    Mazur, M.
    Kaczmarek, D.
    Morgiel, J.
    Poniedziałek, A.
    Domaradzki, J.
    Czeczot, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/779688.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    TiO2
    neodymium
    thin films
    magnetron sputtering
    photocatalysis
    phenol decomposition
    Opis:
    Titanium dioxide thin films doped with the same amount of neodymium were prepared using two different magnetron sputtering methods. Thin films of anatase structure were deposited with the aid of Low Pressure Hot Target Magnetron Sputtering, while rutile coatings were manufactured using High Energy Reactive Magnetron Sputtering process. The thin films composition was determined by energy dispersive spectroscopy and the amount of the dopant was equal to 1 at. %. Structural properties were evaluated using transmission electron microscopy and revealed that anatase films had fibrous structure, while rutile had densely packed columnar structure. Atomic force microscopy investigations showed that the surface of both films was homogenous and consisted of nanocrystalline grains. Photocatalytic activity was assessed based on the phenol decomposition. Results showed that both thin films were photocatalytically active, however coating with anatase phase decomposed higher amount of phenol. The transparency of both thin films was high and equal to ca. 80% in the visible wavelength range. The photoluminescence intensity was much higher in case of the coating with rutile structure.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 103-111
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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