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

100%
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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Optical, Structural, and Electrical Properties of Aromatic Triphenylamine-Based Poly(azomethine)s in Thin Layers

76%
Palewicz M., Iwan A., Sikora A., Doskocz J., Strek W., Sek D., Mazurek B.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
439-444
EN
Spectroscopic and photophysical properties of the poly(azomethine)s with triphenylamine moieties were investigated by UV-vis, X-ray diffraction and atomic force microscopy methods. Current-voltage measurements were performed on ITO/polymer/Alq_3/Al, ITO/PEDOT/polymer:MWCNT/Al and ITO/polymer:MWCNT/Al devices. Multiwall carbon nanotubes were blended with polymer in the ratio 1:1. The lowest optical band gap value at 2.33 eV was detected. Moreover, an absorption coefficient α was calculated from transmission and reflectivity measurements. In this paper, we presented photophysical and structural properties of the poly(azomethine)s in solid state of great interest for the emerging field of molecular electronics and for their uses as active layers in (opto)electronic devices such as solar cells.
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