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Title: Characterization of nano-sized CdS–Ag2S core-shell nanoparticles using XPS technique
Authors: HOTA, G
Keywords: cadmium sulfide
energy dispersive spectroscopy
synthesis (chemical)
scanning electron microscopy
x-ray photoelectron spectroscopy
Issue Date: 2007
Publisher: Elsevier
Citation: Colloids and Surfaces A: Physicochemical and Engineering Aspects 293(1-3), 5-12
Abstract: This paper reports the use of X-ray photoelectron spectroscopy (XPS) method for the characterization of surface composition of core and shell nanoparticles. The core and shell nanoparticles were synthesized using sodium bis(2-ethylhexyl) sulfosuccinate (AOT)/n-heptane/water microemulsion technique. The post-core and partial microemulsion methods have shown promise for core and shell formation and enhanced stability and sphericity of the semiconductor nanoparticles. In addition to above technique, the core-shell nanoparticles have also been characterized using SEM-elemental detection X-ray analysis (EDAX) and results are discussed. The XPS studies of CdS, Ag2S, and CdS–Ag2S nanoparticles prepared by post-core/partial microemulsion methods were carried out and results are compared with physical mixing of CdS and Ag2S nanoparticles. The Ag/Cd atomic ratio is found to be 5 and 10 as determined by XPS methods for nanoparticles prepared by using post-core and partial microemulsion methods, respectively. These results show the formation of core and shell nanoparticles.
URI: http://dx.doi.org/10.1016/j.colsurfa.2006.06.036
ISSN: 0927-7757
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