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RISS 인기검색어
- 검색키워드
- 저자 : Jamil K. Salem (검색결과 2 건)
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SYNTHESIS, CHARACTERIZATION, AND OPTICAL PROPERTIES OF Y-DOPED ZnO NANOPARTICLES
TALAAT M. HAMMAD,JAMIL K. SALEM,ROGER G. HARRISON 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.4
Zinc oxide (ZnO) and yttrium-doped ZnO nanoparticles with particle size in the nanometer range have been successfully synthesized by the alkali precipitation method. The nanoparticle size and morphology have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The average particle size of Y-doped ZnO nanoparticles is about 17–29 nm. The absorption and photoluminescence (PL) spectra of the undoped and doped ZnO nanoparticles were also investigated. The optical band gap of ZnO nanoparticles can be tuned from 3.27 to 3.40 eV with increasing yittrium doping levels from 0 to 5%. The nanoparticles gave two emission peaks, one at around 376 nm and the other at 500 nm.
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Optical Properties of Mg- and Ni- Doped Ag2S Colloidal Nanoparticles
Talaat M. Hammad,Aowda M. Shallah,Jamil K. Salem 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.5
In this work, we report the optical properties of Mg- and Ni-doped Ag2S colloidal nanoparticles. The Mg- and Ni-doped Ag2S nanoparticles were prepared using a wet chemical method. The in uence of doping on the optical properties of the Mg- and Ni-doped Ag2S nanoparticles was investigated. The transmission electron microscopy (TEM) images showed the shapes of particles to be spherical with an average particle size of about 5 - 18 nm for all pure and doped Ag2S nanoparticles. The absorption spectra of the Mg-doped samples were red shifted from 2.42 to 2.20 eV, however, the UV-vis spectra of the Ni-doped Ag2S showed a blue shift from 2.42 to 2.60 eV. The observed blue shift in the band gap of Ni-doped Ag2S may be due to the substitution of Ni in to the Ag2S lattice. The photoluminescence intensity of the Mg-doped Ag2S nanoparticles increased as the Mg concentration was increased. However, the photoluminescence (PL) intensity of the Ni-doped Ag2S decreased as the concentration of Ni was increased.
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