Titanium oxide electronic properties

The above results on detection of trace concentrations of oxygen by sine oxide films (and titanium oxide films, to a lesser degree), as well as the results on detection of alkyl radicals, which are acceptors of semiconductor electrons, show that the behaviour and electric properties of... 

Polycrystalline GaN UV detectors have been realized with 15% quantum efficiency [4], This is about 1 /4 of the quantum efficiency obtained by crystalline devices. Available at a fixed price, however, their increased detection range may well compensate their lack in sensitivity. Furthermore, new semiconductor materials with a matching band gap appear as promising candidates for UV detection if the presumption of the crystallinity is given up. Titanium dioxide, zinc sulfide and zinc oxide have to be mentioned. The opto-electronic properties and also low-cost production processes for these compound semiconductors have already been investigated to some extent for solar cell applications [5]. 

The advanced metal ion-implantation method has been successfully applied to modify the electronic properties of the titanium oxide photocatalysts, enabling... 

Zinc orthotitanate [12036-69-0], ZmTi04, a white solid having a density of 512(0) and a spinel structure, is obtained by heating the calculated amounts of the two oxides at 1000°C. Zinc orthotitanate forms a series of solid solutions with titanium dioxide, extending to the composition Zn2Ti04 1.5Ti02. These solid solutions begin to dissociate at 775°C with the formation of the rutile form of titanium dioxide. The properties of the rare-earth titanates and their electronic structure are available (117—119). 

Modes, T., Scheffel, B., Metzner, C., Zywitzki, O. and Reinhold, E. (2005). Structure and properties of titanium oxide layers deposited by reactive plasma activated electron beam evaporation. Surf. Coat. Technol. 200(1 4), 306-309. 

In this section this field of study is reviewed with reference to work on zinc oxide and titanium oxide. Two comprehensive articles on the electronic properties of zinc oxide IO4) and of rutile (106) serve very well to provide the physical background. 

Let us finally turn to a brief discussion of the third term, Ti02 (i.e., titanium dioxide). Ti02 has three different crystal structures [18] rutile, anatase, and brookite only the former two of them are commonly used in photocatalysis. Like for many other metal oxides (also for titanium oxide) have the respective structural, optical, and electronic properties... 

Titanium dioxide exhibits optical properties very similar to those of tungsten oxide. Electrons in the conduction band become localized by the electron-phonon interaction and give rise to polaron absorption. Coatings of titanium oxide are less stable in an electrochromic device than films of tungsten oxide, and have therefore not been used so much. 

The use of local electronic-structure properties conception in the chemical-bonding analysis was demonstrated also in ab-initio calculations of crystaUine metal oxides, discussed in the next section using the example of titanium oxides. 

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