Abstract
Lead sulfide (PbS) nanoparticles were synthesized by precipitation process. Taguchi analysis was used in this study to optimize experimental conditions. High-purity PbS nanoparticles in different sizes were synthesized on a relatively large scale by precipitation method using addition of leads ion solution to the sulfide reagent. The effect of reaction conditions such as: lead (Pb) and sulfide (S) concentrations, flow rate of reagent addition, and temperature on the diameter of synthesized PbS particles were investigated. The effect of these factors on the size of PbS particles were quantitavely evaluated by the analysis of variance (ANOVA). The results showed that PbS nanoparticles can be synthesized by controlling Pb concentration, S concentration, flow rate of reagent addition. Finally, the optimum conditions for synthesis of PbS nanoparticles by direct precipitation method were proposed. The results of ANOVA showed that 0.1 mol/L Pb concentration, 0.1 mol/L sulfide concentration, and 10 ml/min flow rate of Pb addition to the sulfide ion solution are optimum conditions for producing PbS nanoparticles with 83 ± 8 nm particle size.
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