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    Wyświetlanie 1-8 z 8
    Tytuł:
    Badania spektroskopowe dowodów odbarwiania olejów napędowych i lekkich olejów opałowych przeznaczanych na cele energetyczne
    Autorzy:
    Grabowski, I.
    Zaleszczyk, G.
    Sznajder, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/274145.pdf
    Data publikacji:
    2010
    Wydawca:
    Roble
    Tematy:
    olej opałowy
    olej napędowy
    odbarwianie
    fluorescencja rentgenowska
    spektroskopia UV-VIS
    UV-Vis
    heating oil
    diesel fuel
    decolourization
    X-ray fluorescence
    UV-Vis spectroscopy
    Źródło:
    LAB Laboratoria, Aparatura, Badania; 2010, 15, 6; 28-32
    1427-5619
    Pojawia się w:
    LAB Laboratoria, Aparatura, Badania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of the Optical Losses in CdTe/ZnTe Thin-Film Solar Cells
    Autorzy:
    Chusnutdinow, S.
    Pietruszka, R.
    Zaleszczyk, W.
    Makhniy, V.
    Wiater, M.
    Kolkovsky, V.
    Wojtowicz, T.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375701.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Hi
    73.61.Ga
    85.60.Dw
    88.40.jm
    Opis:
    We report on reduction of optical losses in n-CdTe/p-ZnTe thin-film solar cells grown by molecular beam epitaxy. The investigated thin-film devices were grown from elemental sources on monocrystalline, semi-insulating, (100)-oriented GaAs substrates. The optical losses have been reduced by a texturing of the device surface and by depositing of a ZnO antireflection coating. Current-voltage and spectral characteristics of the investigated p-ZnTe/n-CdTe solar cells depend significantly on the preparation of the surface of the ZnTe window. We describe a procedure of chemical etching of the ZnTe window leading to surface texturing. A ZnO layer of proper thickness deposited by low-temperature atomic layer deposition technique on the ZnTe surface forms an effective antireflection coating that leads to the reduction of optical losses. Due to reduction of the optical losses we observe increase of the short-circuit current, $J_{SC}$, by almost 60% and of the energy conversion efficiency by 44%.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1072-1075
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Force Microscopy Study of $Zn_{1-x}Co_{x}O$ Nanowires Grown by Rapid Thermal Evaporation
    Autorzy:
    Aleszkiewicz, M.
    Fronc, K.
    Aleszkiewicz, P.
    Zaleszczyk, W.
    Dziawa, P.
    Wojciechowski, T.
    Wojtowicz, T.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791327.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Rt
    62.23.Hj
    Opis:
    In this work we studied domain structure of $Zn_{1-x}Co_{x}O$ nanowires which are single arms of tetrapode crystals. The as-grown material exhibits hysteretic behavior even at room temperature as revealed by SQUID mesurements. In order to get insight into the magnetic properties of individual tetrapodes they were dismembered into nanowires of nanometric diameters, deposited on a flat substrate and imaged by magnetic force microscopy. A magnetic interaction between the magnetic force microscopy probe and single nanowires has been detected which confirms that nanometric volume of the material possesses a magnetic moment. The magnetic force microscopy contrast is attractively independent of the tip magnetization direction which indicates that shape anisotropy of nanowires is not strong enough to prevent occurrence of tip-induced magnetic field disturbance.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 865-867
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Properties of ZnO and ZnCdO Nanowires
    Autorzy:
    Zaleszczyk, W.
    Fronc, K.
    Aleszkiewicz, M.
    Paszkowicz, W.
    Wróbel, J.
    Dłużewski, P.
    Kret, S.
    Klepka, M.
    Kłopotowski, Ł.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047698.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    We report on the photoluminescence studies of ZnO and ZnCdO nanowires grown on SiO$\text{}_{2}$/Si substrates by low-pressure vapor phase synthesis. X-ray diffraction and transmission electron microscopy measurements show that the crystallographic structure of these ZnO and ZnCdO nanowires is of wurtzite-type with a high crystal perfection. Surface morphology of samples was determined by scanning electron microscopy and atomic force microscopy. The photoluminescence spectra of as-grown nanowires, nanowires extracted from the substrate and deposited onto Si wafer, and nanowires dispersed in ethanol by sonication were investigated at room temperature and compared to each other. The temperature dependence of the near band-gap photoluminescence emitted by the as-grown nanowires was also measured and analyzed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 357-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Properties of ZnO Nanowires Grown on Ni Substrate
    Autorzy:
    Zaleszczyk, W.
    Fronc, K.
    Przeździecka, E.
    Janik, E.
    Czapkiewicz, M.
    Wróbel, J.
    Paszkowicz, W.
    Kłopotowski, Ł.
    Karczewski, G.
    Wojtowicz, T.
    Presz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812028.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    Photoluminescence studies of zinc oxide nanowires produced by a carbo-thermal method on a nickel foil substrate are reported. Two types of as-grown samples: the first - containing only buffer film, and the second - containing both zinc oxide nanowires and buffer film grown in the same technological process, were investigated by means of the temperature-dependent photoluminescence. X-ray diffraction measurements of buffer film show that it is polycrystalline and is composed from wurtzite-type ZnO (main phase) and includes minority phases: rock salt type (Ni,Zn)O and hexagonal C₃N₄. The shape of the apparently monocrystalline nanowires is characterized by hexagonal section matching with the expectations of the hexagonal ZnO structure. The presence of LO-phonon replicas in photoluminescence spectra for the second sample is used as an argument for confirmation that ZnO nanowires are single crystalline. The method of growth of ZnO nanowires on nickel oxide opens perspectives to produce $Zn_{1-x}Ni_{x}O$ diluted magnetic semiconductor nanowires.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1451-1456
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Properties of ZnCoO Tetrapods and Nanofibers
    Autorzy:
    Gas, K.
    Fronc, K.
    Dziawa, P.
    Knoff, W.
    Wojciechowski, T.
    Zaleszczyk, W.
    Baranowska-Korczyc, A.
    Morhange, J.
    Paszkowicz, W.
    Elbaum, D.
    Karczewski, G.
    Wojtowicz, T.
    Szuszkiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791329.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    78.67.Bf
    81.05.Dz
    81.07.Bc
    Opis:
    In this paper the physical properties of two types of Co-doped ZnO nanostructures: tetrapods and nanofibers grown by a rapid thermal evaporation process and prepared by the electrospinning technique, respectively, were investigated and analyzed. Surface morphology of the samples was examined using scanning electron microscopy. X-ray diffraction measurements showed hexagonal wurtzite crystal structure of both types of investigated nanostructures. Both X-ray diffraction and Raman scattering data confirmed high phase purity of the samples. The magnetic properties studied with the use of the SQUID magnetometer confirmed a presence of ferromagnetic order in analyzed nanostructures. The observed photoluminescence spectra exhibited two groups of lines. The first one, in the ultraviolet spectral range, is due to the optical transitions close to ZnO band gap, the second one in the red region is most probably related to the $Co^{2+}$ d-d internal transitions. The influence of native defects on the optical properties is also shown and discussed. All results reported here lead us to the conclusion that in the mixed crystal nanostructures obtained, a fraction of the $Zn^{2+}$ ions is substituted by $Co^{2+}$ ions.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 868-870
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Selected Properties of Core/Shell ZnTe-Based Nanowire Structures Containing ZnO
    Autorzy:
    Gas, K.
    Janik, E.
    Zaleszczyk, W.
    Pasternak, I.
    Dynowska, E.
    Fronc, K.
    Kolkovsky, V.
    Kret, S.
    Morhange, J. F.
    Reszka, A.
    Wiater, M.
    Caliebe, W.
    Karczewski, G.
    Kowalski, B. J.
    Szuszkiewicz, W.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047950.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Hk
    68.37.Lp
    68.65.La
    81.07.Vb
    Opis:
    We report on an approach to fabricate ZnTe-based core/shell radial heterostructures containing ZnO, as well as on some of their physical properties. The molecular beam epitaxy grown ZnTe nanowires constituted the core of the investigated structures and the ZnO shells were obtained by thermal oxidation of ZnTe NWs. The influence of the parameters characterizing the oxidation process on selected properties of core/shell NWs were examined. Scanning electron microscopy revealed changes of the NWs morphology for various conditions of the oxidation process. X-ray diffraction, high resolution transmission electron microscopy, and Raman scattering measurements were applied to reveal the presence of ZnTe single crystal core and polycrystalline ZnO-shell of investigated structure.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 612-614
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Properties of ZnMnTe Nanowires
    Autorzy:
    Zaleszczyk, W.
    Janik, E.
    Presz, A.
    Szuszkiewicz, W.
    Morhange, J. F.
    Dłużewski, P.
    Kret, S.
    Kirmse, H.
    Neumann, W.
    Dynowska, E.
    Domagała, J. Z.
    Caliebe, W.
    Aleszkiewicz, M.
    Pacuski, W.
    Golnik, A.
    Kossacki, P.
    Baczewski, L. T.
    Petroutchik, A.
    Karczewski, G.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047697.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    68.65.La
    78.55.Et
    78.67.Bf
    81.15.Hi
    Opis:
    Catalytically enhanced growth of ZnMnTe diluted magnetic semiconductor nanowires by molecular beam epitaxy is reported. The growth is based on the vapor-liquid-solid mechanism and was performed on (001) and (011)-oriented GaAs substrates from elemental sources. X-ray diffractometry, scanning and transmission electron microscopy, atomic force microscopy, photoluminescence spectroscopy, and Raman scattering were performed to determine the structure of nanowires, their chemical composition, and morphology. These studies revealed that the obtained ZnMnTe nanowires possess zinc-blende structure, have an average diameter of about 30 nm, typical length between 1 and 2μm and that Mn$\text{}^{2+}$ ions were incorporated into substitutional sites of the ZnTe crystal lattice.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 351-356
    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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