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Effect of Annealing on the Crystal Structure and Microstructure of Pr Doped ZrO_{2}-Y_{2}O_{3} Nanocrystals

100%
Werner-Malento E., Paszkowicz W., Fidelus J., Godlewski M., Yatsunenko S.
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issue 1
91-97
EN
Rare-earth doped nanocrystalline yttria-stabilized zirconia (YSZ, ZrO_{2}-Y_{2}O_{3}) is, recently, a subject of studies because of its luminescent properties. The luminescence may be strongly influenced by the crystal structure and microstructure of the material. In this work, the X-ray diffraction study for Pr doped YSZ nanocrystals is presented. The phase composition dependence on the Y_{2}O_{3} content and on heat treatment conditions is quantitatively determined using the Rietveld method and the similarities and differences between the present data for doped samples and earlier reported data for undoped material are discussed. A formation of high symmetry phases (cubic and tetragonal) is observed for high yttria content in agreement with general tendencies observed in literature for undoped samples.
2
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Positron-Annihilation, Structural and Optical Studies on Properties of Nanostructured ZrO_2, ZnO, Bi_2O_3 and ZnO-Bi_2O_3

86%
Fidelus J., Karbowski A., Grabis J., Jusza A., Piramidowicz R., Brusa R., Karwasz G.
Acta Physica Polonica A
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2011
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vol. 120
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issue 6A
A-66-A-68
EN
Nanostructured oxides, like ZrO_2, on ZnO and Bi_2O_3 show interesting electronic and photovoltaic properties. Pressed and annealed samples were obtained from nanopowders grown in hydrothermal or plasma processes. Positron annihilation (the Doppler broadening depth-resolved, positron lifetime) techniques were used to trace structural changes in samples after annealing. Photoluminescence spectra of all investigated samples show broad-band emission in the visible, with intensity depending on annealing temperature. The change in nanoporosity and positron lifetimes correlate well with changes in photoluminescence properties. The nature of broad photoluminescence bands is to be understood; further positron studies via the Doppler coincidence method would help in identifying the nature of defects in these samples.
3
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Optical Properties of ZnCoO Films and Nanopowders

86%
Wolska E., Łukasiewicz M., Fidelus J., Łojkowski W., Guziewicz E., Godlewski M.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
918-920
EN
ZnCoO is one of the most studied and promising semiconductor materials for spintronics applications. In this work we discuss optical and electrical properties of ZnCoO films and nanoparticles grown at low temperature by either atomic layer deposition or by a microwave driven hydrothermal method. We report that doping with cobalt quenches a visible photoluminescence of ZnO. We could observe a visible photoluminescence of ZnO only for samples with very low Co fractions (up to 1%). Mechanisms of photoluminescence quenching in ZnCoO are discussed. We also found that ZnO films remained n-type conductive after doping with Co, indicating that a high electron concentration and cobalt 2+ charge state can coexist.
4
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Hybrid Organic/ZnO p-n Junctions, with n-Type ZnO, Grown by Atomic Layer Deposition

73%
Łuka G., Krajewski T., Szczerbakow A., Łusakowska E., Kopalko K., Guziewicz E., Wachnicki Ł., Szczepanik A., Godlewski M., Fidelus J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 5
1229-1234
EN
We report on fabrication of hybrid inorganic-on-organic thin film structures with polycrystalline zinc oxide films grown by atomic layer deposition technique. ZnO films were deposited on two kinds of thin organic films, i.e. pentacene and poly(dimethylosiloxane) elastomer with a carbon nanotube content (PDMS:CNT). Surface morphology as well as electrical measurements of the films and devices were analyzed. The current density versus voltage (I-V) characteristics of ITO/pentacene/ZnO/Au structure show a low-voltage switching phenomenon typical of organic memory elements. The I-V studies of ITO/PDMS:CNT/ZnO/Au structure indicate some charging effects in the system under applied voltages.
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