Compositional analysis and optical properties of Co doped TiO2 thin films fabricated by spray pyrolysis method for dielectric and p hotocatalytic applications

Influence of Co-Content on the Optical and Structural Properties of TiOx Thin Films Prepared by Gas Impulse Magnetron Sputtering

“…However, the literature lacks comprehensive analyses of titanium oxide coatings with neither low nor high Co content. A significantly different character can be seen for nanoparticles (Figure 8b) [9,21,25,27]. These nanomaterials have a similar value of the light transmission coefficient (from 60% to 90%).…”

“…It is difficult to determine the reason for the lack of changes with the increase in Co content. This can be determined by the manufacturing method or may be related to the fact that the core of the nanoparticles is TiO 2 and cobalt is located in its shell [9,25,27]. The solution to this shortcoming may be additional annealing, which will almost certainly cause oxygenation of the film structure.…”

“…often manufactured as nanoparticles [4,6,9], which are useful in energy storage or solar energy conversion [4]. Nanoparticles are usually manufactured by sol-gel [9], hydrothermal [8], calcination [24], pyrolysis [25], or plasma thermal treatment [26] methods (Figure 3a). It should be noted that in the case of nanoparticles, typically only crystalline titanium dioxide is identified, and the influence of Co content on their properties has not been well explored [4,26].…”

“…As mentioned above, in the case of oxide nanomaterials based on titanium and cobalt, their material composition is a key factor. The current state of the art indicates that in nanoparticles, as well as in thin-film coatings, the amount of cobalt is usually below 15 at.% [5,27,38] (Figure 4), although there Nanoparticles are usually manufactured by sol-gel [9], hydrothermal [8], calcination [24], pyrolysis [25], or plasma thermal treatment [26] methods (Figure 3a). It should be noted that in the case of nanoparticles, typically only crystalline titanium dioxide is identified, and the influence of Co content on their properties has not been well explored [4,26].…”

“…As can be seen, there is a research gap regarding materials with cobalt content comparable to or greater than titanium. As an analysis of the literature shows, most of these materials are crystalline [5,25,38], while approximately 14% of the total work has been devoted to amorphous materials [31,39]. Therefore, it can be seen that the main focus has been on investigating the influence of cobalt on TiO 2 properties only within a narrow range of this element, completely discounting what modifications in (Ti,Co)Ox films would be introduced by a higher amount of cobalt.…”