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Nanocrystalline Chalcogenides Synthesis in Aqueous Environments
C. ONOSE, C. S. ONOSE, H. NICIU
Abstract. Zinc and cadmium sulphide is an inorganic compound that has
many uses as a pigment, phosphor and semiconductor material. This paper is
an experimental study on obtaining methods of nanocrystalline ZnxCd1-xS
from aqueous solutions. We have investigated the dependence of ZnxCd1-xS nanoparticles size and properties on composition, pH and concentration of
the starting solution. The method consists in co-precipitation of
ZnxCd1-xS from CdSO4/Cd(NO3)2 and ZnSO4/Zn(NO3)2 solutions, by adding an
exceeding amount of Na2S at high solution pH.
The precipitation reaction takes place in aqueous solutions, in the
presence of a chemical stabilizer as styrene-maleic anhydride or acrylic
acid-maleic anhydride co-polymers. The stabilizer provides a colloidal
state of the synthesized material and does not allow ZnxCd1-xS nanoparticles to agglomerate. These compositions work better, as
photosensitive, on light energy conversion. Additionally they can be used
as ceramic pigments or luminescent pigments (after doping) in industrial
printers. |