Vanadium dioxide (VO₂) sol-gel synthesis

Vanadium dioxide (VO₂) is a thermochromic material known for its reversible metalinsulator transition (MIT) near 68°C, making it ideal for smart windows, sensors, and energy-efficient coatings. This transition allows the vanadium dioxide to modulate infrared radiation dynamically, reducing energy consumption in buildings and contributing to sustainable technology. Due to its unique ability to switch between metallic and insulating states, VO₂ has attracted significant interest in various applications, including optoelectronics and thermal regulation systems.

This study explores the sol-gel synthesis of Vanadium dioxide as well as the film variant through a cost-effective, scalable method that enables precise control over stoichiometry and doping. The sol-gel method offers advantages in terms of material uniformity and flexibility and goes through infrared reflection testing more desirably than the film, proving that it is better suited to an electrical current testing environment. The sol-gel process involves hydrolysis and polycondensation of vanadium precursors, followed by thermal treatment to crystallize the desired VO₂ phase. Carefully optimizing this synthesis conditions is crucial for obtaining phase-pure VO₂ with desirable properties through this fragile process.

Our desire is to achieve the highest purity of VO ₂ by optimizing precursor concentration, aging time, and annealing temperatures. The effect of these parameters on phase formation and transition behavior is systematically investigated and varied. Structural characterization techniques, including spectroscopy using a laser diode and testing conductive capabilities through certain temperatures with an ammeter, confirm the successful formation of VO₂. Conductivity and optical reflection measurements of the pressed ceramics confirm the metal-insulator switching, validating the effectiveness of the synthesis approach. The findings provide insights into improving VO₂ processing for practical applications, enhancing its potential for large-scale implementation in energyefficient technologies.