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Wyszukujesz frazę "Farjami Shayesteh, S." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Effect of pH on the Optical Properties of Doped CdS (Cu, Fe) Nanoparticles Incorporated in TG as the Capping Agent
Autorzy:
Hasanzadeh, J.
Farjami Shayesteh, S.
Abdolahzadeh Ziabari, A.
Powiązania:
https://bibliotekanauki.pl/articles/1205134.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
78.67.-n
Opis:
Cu and Fe doped cadmium sulfide nanoparticles with controllable and relatively narrow size distribution were prepared using a facile and efficient wet chemical route by mixing the reactants in water solvent. It was found that the mixture pH plays an active role in the growth procedure of nanoparticles. Diverse physical properties of the prepared nanoparticles were investigated using UV-vis absorption, photoluminescence spectroscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The average particle size of samples was estimated to be about 5 nm by using transmission electron microscopy measurement. The pH optimization study implies that $pH ≈7$ would yield an enhancement in photoluminescence intensity. There are two bands in photoluminescence spectra which related to deep and shallow traps.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 713-716
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence Properties of Manganese Doped CdS Nanoparticles under Various Synthesis Conditions
Autorzy:
Salimian, S.
Farjami Shayesteh, S.
Powiązania:
https://bibliotekanauki.pl/articles/1535741.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ga
74.25.Gz
78.55.Et
81.16.Be
Opis:
An aqueous solution method has been developed for synthesizing size-controlled $Mn^{2+}$ doped CdS nanocrystals with a relatively narrow size distribution. The nanocrystal samples were characterized by UV-Vis absorption spectra and photoluminescence spectra. We prepared narrow size distribution particles under different synthesis conditions. The effect of manganese concentration on the photoluminescence properties was investigated. Luminescence intensity in different excitation wavelength correlates with different size of CdS:Mn nanocrystals on luminescence spectra. We found that by narrowing the size distribution and doping concentration, CdS samples can be prepared with high luminescence intensity.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 633-636
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Magneto-Optical Response of Diluted Magnetic Semiconductor $CdTe-Cd_{1-x}Mn_{x}Te$ Multi Quantum Wells in the Voigt Configuration
Autorzy:
Hidari, M.
Farjami Shayesteh, S.
Powiązania:
https://bibliotekanauki.pl/articles/1807790.pdf
Data publikacji:
2009-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
78.30.-j
78.20.Ls
73.21.Fg
Opis:
We have calculated the s- and p-polarized far infrared magnetoplasmon spectra of doped $CdTe-Cd_{1-x}Mn_{x}Te$ multi quantum wells in the presence of a static magnetic field up to 20 T parallel to the surface of the layers using a macroscopic model based on effective medium theory, using a novel approach which gives a good account of the data together with a clear physical interpretation of the various spectral features, such as the free carrier and optical phonon properties. The results show that the transverse optical modes (for the whole composition range, x = 0 to 1) are sensitive and change linearly with respect to the composition parameter. In p-polarized reflectivity the cyclotron resonance experiences a blue shift when the magnetic field strength increases. Also, the analysis of the dielectric tensor function and the Voigt dielectric function is used to determine the carriers' cyclotron effective masses (for both holes and electrons) as a function of composition. Furthermore, a modified random element iso-displacement approach has been extended for the multi layers to analyze the influence of the composition on the optical phonon response in the barrier layer.
Źródło:
Acta Physica Polonica A; 2009, 116, 2; 232-237
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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