High temperature (400°C to 800°C) are typically used to achieve crystalline nanoparticles, lower temperatures can also be used with specific modifications. Besides temperature and gel composition, solvent plays an important role in determining the shape and size of the AgNPs . Generally, organic solvents are preferred, due to their oxygen supplying characteristic for metal, which helps to control particle uniformity and size distribution . The process enables customization of nanoparticles as it allows for a wide range of precursors and additives . Additionally, the sol-gel process can synthesize AgNPs in hot aqueous environment under high pressure and also at low temperatures . However, producing thick nanoparticle-doped films without defects like cracks is difficult . Often the sol-gel process is associated with costly precursors and reproducibility issues, particularly in large scale production . The film quality is highly dependent on environmental conditions such as humidity and temperature .