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Optical Properties of TiO₂ Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

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Ozimek M., Palewicz M., Hreniak A.
Acta Physica Polonica A
|
2016
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vol. 129
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issue 6
1214-1219
EN
Titanium dioxide doped nanopowders were prepared in two ways: (i) by applying a sol-gel method and (ii) by applying the sol-gel synthesis as the first step for pure TiO₂ preparation, and next, doped by using magnetron sputtering technique, that is one of a physical vapour deposition method. Silver and copper (Ag, Cu) metals were used as the dopants. Prepared samples were investigated by scanning electron microscope, X-ray diffraction and UV-Vis spectroscopy. The effect of the dopants' nature and the applied doping method were studied. The results showed that each prepared particles are nanocrystalline materials with particles diameter range from 80 nm to 500 nm (depending on the doping method). From optical experiments, it was possible to observe changes in absorbance spectra, which are probably related to interfacial charge transfer and the localized surface plasmon resonance phenomenon.
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Nanoscopic Investigation of Magnetic Thin Films by Means of Magnetic Force Microscopy Technique

100%
Sikora A., Ozimek M., Wilczyński W.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 6
1226-1229
EN
In the article the results of the research aimed at the recognition of the correlation between the Ni-Fe film thickness and its magnetic domain structures are described. Magnetic thin films were prepared by pulse magnetron sputtering. Obtained thin film thicknesses were in the range of 47.6-326.0 nm. Magnetic domain structures were imaged using magnetic force microscopy. In order to obtain quantitative description of magnetic domains images, the algorithms designed for topography parameters determination were applied, enabling the comparison of specific factors related to the magnetic properties of the samples. Utilized approach provided the analysis of the impact of sputtering parameters on the morphological and magnetic properties of obtained films.
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