1：Experimental Design and Method Selection:

The sol–gel precipitation method was used to synthesize CdO : ZnO hexagonal particles at different annealing temperatures.

2：Sample Selection and Data Sources:

Analytical grade chemicals were used as source materials. Two separate solutions of similar concentration were prepared for the nanocomposites.

3：List of Experimental Equipment and Materials:

Cadmium acetate dehydrate (CdAc, Sigma Aldrich) and zinc acetate dehydrate (ZnAc, Alfa Aesar) for cadmium (Cd) and zinc (Zn), respectively. A microprocessor controlled furnace for drying.

4：Experimental Procedures and Operational Workflow:

The two solutions were spun together in a 3 : 1 volume ratio of CdO : ZnO solutions for 2 h at room temperature. After aging for 24 h, sodium hydroxide (NaOH) was added dropwise as a precipitating reactant. The final products were annealed at four different temperatures.

5：Data Analysis Methods:

The structural properties were investigated by X-ray diffraction (XRD). The morphology and elemental study of the samples were examined using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The current–voltage (I–V) measurements were carried out using a Keithley 4200-SCS electrometer.