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In this work, we report the study of growth of CdS as well as ZnS nanocrystals using in-situ small angle X-ray scattering (SAXS) technique, in presence of thio-glycerol as capping agent. It is found that the temperature of the reaction is found to affect the diameter as well as the relative width of the distribution. Higher synthesis temperature decreases the relative width of the distribution and increases the diameter of the nanocrystals. We observe that the diameter of the nanocrystal is controlled between 1 and 3 nm by varying the temperature of the reaction. Further, the self-focusing of the size distribution can be observed and is more pronounced at higher temperatures reducing its relative width from 25 % to 10 %.