1：Experimental Design and Method Selection:

VO2 (M) was synthesized by thermolysis of vanadyl ethylene glycolate (VEG), obtained by precipitation of a vanadium precursor in ethylene glycol solution under atmospheric conditions. The particle size and shape were controlled by altering the molar concentration of the vanadium precursor. VO2 (M) composite films were prepared by mixing with poly(vinylpyrrolidone) (PVP).

2：Sample Selection and Data Sources:

Ammonium metavanadate (AMV) was used as the vanadium precursor, with concentrations varied between 0.17 and 1.50 M.

3：17 and 50 M. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Materials included AMV, ethylene glycol (EG), PVP, ethanol, and deionized water. Equipment included a furnace for heat treatment, spin coater for film fabrication, and various characterization tools (XRD, FE-SEM, DSC, UV-Vis-NIR spectroscopy).

4：Experimental Procedures and Operational Workflow:

VEG was synthesized by heating AMV with EG, filtered, and heat-treated to form VO2 (M). Composite films were prepared by dispersing VO2 (M) in ethanol with PVP, then spin-coated onto glass substrates.

5：Data Analysis Methods:

The crystalline structures were characterized by XRD, morphologies by FE-SEM, phase-transition behaviors by DSC, and thermochromic properties by UV-Vis-NIR spectroscopy.