1：Experimental Design and Method Selection:

The study involved the synthesis of CdS quantum dots using one-step and two-step approaches in an octadecene/glycerol two-phase system. The effects of reaction temperature, time, reactant concentrations, and synthesis routes on nucleation and particle growth were examined.

2：Sample Selection and Data Sources:

Cadmium oxide (CdO), oleic acid (OA), 1-octadecene (ODE), thiourea, and glycerol were used as precursors. The structural and optical properties of CdS QDs were characterized by TEM, UV–vis absorption spectroscopy, and fluorescence spectrum measurements.

3：List of Experimental Equipment and Materials:

Cadmium oxide (CdO, ≥99%), oleic acid (OA, AR), 1-octadecene (ODE, 90%), thiourea (AR), and glycerol (AR) were used. Equipment included a UV-2550 spectrophotometer, F-7000 fluorescence spectrometer, and HT7700 transmission electron microscope.

4：Experimental Procedures and Operational Workflow:

CdS QDs were synthesized via one-pot and two-step routes in the ODE/glycerol two-phase system. The temporal evolution of absorption and emission spectra was recorded to monitor the growth of quantum dots.

5：Data Analysis Methods:

The size of CdS QDs was estimated using an empirical formula based on absorption peak positions. The nucleation and growth mechanisms were analyzed based on the evolution of optical spectra.