1：Experimental Design and Method Selection:

The study involved synthesizing CdSe quantum dots in aqueous medium with different capping agents (thioglycolic acid, 2-mercaptoethanol, cysteine, cysteamine) and preparing nanocomposite films with PVA matrix using casting method. Characterization techniques included UV-vis spectroscopy, spectrofluorometry, TGA, DSC, DRS, and AFM to analyze optical, thermal, dielectric, and morphological properties.

2：Sample Selection and Data Sources:

CdSe QDs were synthesized from precursors like cadmium sulphate hydrate and selenium powder, with specific capping agents. PVA was used as the polymeric matrix. All materials were purchased from suppliers and used without further purification.

3：List of Experimental Equipment and Materials:

Equipment included UV-VIS-NIR spectrophotometer (Shimadzu UV-3600), spectrofluorometer (Horiba Felix 32), AFM (Bruker Multimode 8), TGA (TA Instruments TGA 500), DSC (Mettler Toledo DSC3+), DRS analyzer (Novocontrol Alpha), spin coater (Specialty Coating Systems P6700), and micrometer (Mitutoyo QuantuMike). Materials included PVA, CdSe precursors, capping agents, and solvents.

4：Experimental Procedures and Operational Workflow:

CdSe QDs were synthesized by reacting CdSO4 with Na2SeSO3 in the presence of capping agents at specific pH and ratios. Nanocomposites were prepared by mixing QD solutions with PVA solution, casting films, and drying. Characterization involved measuring film thickness, performing spectroscopic, thermal, and dielectric analyses, and imaging with AFM.

5：Data Analysis Methods:

Data were analyzed using standard methods for size calculation from UV-vis, thermal decomposition from TGA, thermal transitions from DSC, dielectric properties from DRS, and morphology from AFM images.