Properties of thin metallic films for microwave susceptors
J. Česnek, J. Dobiáš, J. Houšová, J. Sedláčekhttps://doi.org/10.17221/3475-CJFSCitation:Česnek J., Dobiáš J., Houšová J., Sedláček J. (2003): Properties of thin metallic films for microwave susceptors. Czech J. Food Sci., 21: 34-40.
Thin Al films of varying thickness, i.e. 3 to 30 nm, were deposited onto polyethylene-terephthalate film by evaporation in the vacuum of 3 × 10–3 Pa. The dependence of DC (direct current) surface resistance on thickness was measured using a four-point method. The surface resistance exhibits the size effect in accordance with the Fuchs-Sondheimer theory. The microwave absorption properties of the prepared films of various metallization thickness were measured in a microwave field at the microwave power of 1.8 mW. The maximum microwave absorption at 2.45 GHz was found to occur in a layer of optical density of about 0.22.Keywords:
microwave susceptors; food packaging; optical density; DC surface resistance; microwave absorption