Abstract
On the synthesis of Ag2S-ZnS composite particles from the mixture of silver nitrate and zinc nitrate solution by homogeneous precipitation method using thioacetamide at 70°C, the effect of Ag+ concentration on the morphology of products was investigated.The precipitates were spherical composite particles with narrow size distribution when Ag+ concentrations ≤4×10-4 mol dm-3. At Ag+ concentrations ≥4×10-3 mol dm-3, Ag2S-ZnS composite particles became aggregated ones. The formation of spherical Ag2S-ZnS composite particles occurred by the deposition of ZnS at the initial stage on the surface of Ag2Snuclei which were formed by reaction between Ag+ ion and thioacetamide.
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