1：Experimental Design and Method Selection:

The study involved synthesizing mesoporous silicas using sol-gel methods with different templates (dodecylamine and citric acid) to vary textural properties. CdTe nanocrystals were grown in situ on these silicas. Electrochemical sensors were developed by modifying carbon paste electrodes with the silica-CdTe hybrids for Cu2+ detection using cyclic and differential pulse voltammetry.

2：Sample Selection and Data Sources:

Mesoporous silica samples were synthesized with varying CA/TEOS ratios. Sugar cane spirit samples were obtained from Brazilian producers. Standard solutions of Cu2+ and other ions were prepared for interference studies.

3：List of Experimental Equipment and Materials:

Equipment included a PGSTAT 100/Autolab potentiostat/galvanostat, NOVA 1200 QuantaChrome for N2 adsorption, Perkin Elmer Spectrum BX FTIR, Bruker D8 Advance XRD, Ocean Optics HR2000 UV/Vis, Jasco FP-8600 spectrofluorimeter, Shimadzu AA-100 FAAS, Jeol 2100 TEM. Materials included various chemicals from Sigma-Aldrich, Aldrich, Merck, etc., as listed in the paper.

4：Experimental Procedures and Operational Workflow:

Silica synthesis involved mixing precursors, stirring, filtering, drying, and calcining. CdTe synthesis involved preparing Cd and Te precursors, mixing with silica, hydrothermal treatment, and washing. Electrode preparation involved mixing graphite, modifier, and mineral oil, packing into syringes. Electrochemical measurements included optimization of parameters like pH, electrolyte, preconcentration time and potential, and applying voltammetric techniques.

5：Data Analysis Methods:

Textural properties were analyzed using BET and BJH methods from N2 adsorption isotherms. Spectroscopic data were analyzed for emission and absorption peaks. Electrochemical data were analyzed for peak currents, linear ranges, and detection limits using standard calibration curves.