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The paper explores the possibilities of using carbonyl iron in the form of a powder for the manufacture of radar-absorbing paints – reducing the radar signature of the objects that they cover. The attenuation values in the range of 4–18 GHz for various coating thicknesses, ranging from 0.5 to 2.00 mm with 0.5 mm increment, and for different absorber content −75% and 80%, as well as the use of two different binders in the form of epoxy resins with hardeners, were investigated. For the frequency of 18 GHz and a 1.5 mm thick coating with a 75% absorber content, Epidian 112 resin and Saduramid 10/50 hardener used as a binder, and the maximum attenuation level obtained equalled 20.2 dB at 16 GHz. Additionally, the absorber particle size ranging from 3 to 4 μm and its higher mass content resulted in achieving the reflection loss above −12 dB in the entire 8–12.5 GHz range for layers between 1- and 1.5 mm thickness. The qualitative assessment of the tested samples in the context of camouflage in the radar range was also performed, using statistical analysis.

This work aims at assessment of TiO2as the main layer component for self-cleaning layers in photovoltaic panels. TiO2(derived from titanium (IV) butoxide or titanium (IV) isopropoxide) without and with silver was examined to find titania suitable microstructure and optical properties. For this purpose silver amounts ranging from 0.1 to 1% were used for 3 separate chemical methods of modification. Microstructure of powders was characterized by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with X-ray energy dispersion spectroscopy. Three techniques: spin-coating, doctor blade, and spray-coating were used to deposit TiO2and TiO2–Ag layers on glass and silicon solar cells. The photocatalytic activity of TiO2and TiO2–Ag were investigated in the presence of methylene blue. Concentration of dye, amount of silver, type of TiO2with Ag modification and stability over time were analysed towards the best photocatalytic properties. Finally, TiO2layers which were used to coat a new type of photovoltaic modules had marginal influence on photovoltaic parameters.