نهى.نانو
04-26-2010, 09:09 PM
King Fahd University of Petroleum & Minerals
Department of Physics
Seminar
Speaker: Dr. A. Sunaidi
Physics Department
KFUPM
Title:Structural and Optical Properties of Doped ZnS Nanoparticles
Abstracts:
Semiconductor nanoparticles have attracted much attention in recent years. Zinc-Sulfide (ZnS) nanoparticles, in particular, are known to have excellent optical properties. We used a simple chemical method to prepare ZnS nanoparticles doped with different concentrations of several transition ****l ions. XRD studies show the phase singularity of ZnS nanocrystals having zinc-blende (cubic) structure. The broadening of the XRD peaks indicates that the average crystallite size of the particles is about 5 nm. The TEM micrographs show a spherical shape for ZnS particles whose average size is around 30 nm. These (mesoporous) particles are resulting from the aggregation of the initial crystallites. For Fe-doped ZnS, luminescence and optical absorption spectra indicated a slight blue-shift and a small increase in the band gap energy.
This work was carried out at the University of Manchester (UK) under the sponsorship of the British Council.
Date & Time: Monday, 26 April 2010, 11:00 am
********: Room 6-125 (Auditorium)
There will be a Get-Together and Coffee before the
Seminar at 10:40-10:55 am in Room 6-125 (Auditorium)
All are cordially invited
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المصدر : بريد إلكتروني من مركز التميز البحثي لتقنية النانو
Department of Physics
Seminar
Speaker: Dr. A. Sunaidi
Physics Department
KFUPM
Title:Structural and Optical Properties of Doped ZnS Nanoparticles
Abstracts:
Semiconductor nanoparticles have attracted much attention in recent years. Zinc-Sulfide (ZnS) nanoparticles, in particular, are known to have excellent optical properties. We used a simple chemical method to prepare ZnS nanoparticles doped with different concentrations of several transition ****l ions. XRD studies show the phase singularity of ZnS nanocrystals having zinc-blende (cubic) structure. The broadening of the XRD peaks indicates that the average crystallite size of the particles is about 5 nm. The TEM micrographs show a spherical shape for ZnS particles whose average size is around 30 nm. These (mesoporous) particles are resulting from the aggregation of the initial crystallites. For Fe-doped ZnS, luminescence and optical absorption spectra indicated a slight blue-shift and a small increase in the band gap energy.
This work was carried out at the University of Manchester (UK) under the sponsorship of the British Council.
Date & Time: Monday, 26 April 2010, 11:00 am
********: Room 6-125 (Auditorium)
There will be a Get-Together and Coffee before the
Seminar at 10:40-10:55 am in Room 6-125 (Auditorium)
All are cordially invited
-------------
المصدر : بريد إلكتروني من مركز التميز البحثي لتقنية النانو