Thin Films; are coating materials that are formed as a thin layer by arranging the atoms or molecules of the target material to be coated on a base that helps the formation of the film on the surface, and their thickness is generally under 1-micron scale. It is manufactured by many methods such as sol-gel (dip-coating, etc.), physical vapor deposition, or chemical vapor deposition. One of the most widely used of these is the spraying method. Thin film production techniques; It can be divided into three main classes as vapor phase deposition, liquid phase deposition and solid phase deposition. Thin films can be produced by many different methods such as physical vapor deposition, sol-gel, devitrification and electrochemical methods, which are under these 3 classes. Immersion, electrophoresis and spraying can be given as examples of the methods used to apply thin films. If we consider the dipping and spraying methods, which are commonly used:

Immersion method: the surface to be covered with a thin film layer (glass, metal, textile or wood) is immersed in the coating solution and withdrawn at controlled speeds. A wet film layer forms on the surface. As a result of the evaporation of the solvent, a thin film is deposited on the surface.

Spraying method: It is the method of spraying the homogeneous liquid solutions prepared for the films to be coated on the surface by atomizing them with the help of air or nitrogen gas. It is the easiest and cheapest method among thin film production methods. It is suitable for intervention in the production process and there is no need for a vacuum environment.

The main parameters affecting the film quality are:

• Sub-base temperature,

• Ambient conditions,

• Spray rate,

• Application thickness of the film,

• Diameter of the spray nozzle,

• Distance of spray nozzle from sub-base.