Interactions of liquid and vapor water with stoichiometric and defective TiO2(100) surfaces

Activation and Enhancement of Room-Temperature Ferromagnetism in Cu-Doped Anatase TiO2 Films by Bound Magnetic Polaron and Oxygen Defects

“…It is briefly outlined that the Ti 2p 3/2 peak of Sample A30-1 and A0-1 was broader at lower binding energy than that of the TiO 2 films reported by previous work. [25][26] As proposed by Wang et al, 27 the broadening of Ti 2p 3/2 peak at low binding energy could be ascribed to the appearance of Ti 3+ or Ti 2+ . After performing the deconvolution with Lorentzian-Gaussian distribution function, the Ti 2p 3/2 spectrum of Sample A0-1 displayed two peaks at 459.2 and 457.6 eV, which are assigned to Ti 4+ and Ti 3+ .…”

Photoemission investigations on nanostructured TiO2 grown by cluster assembling

“…For increasing the amount of native defects, titanium dioxide was subjected to thermal annealing, sputtering, electron beam exposure. The induced imperfections, mainly oxygen vacancies, are reflected in changes of the electronic structure of stoichiometric TiO 2 , in particular by a feature at about 1 eV [10,11] below the Fermi edge due to Ti 3d un-hybridized states with O 2p states and by a shoulder at the lower energy side of the XPS Ti 2p 3/2 peak [12]. Considering that native defects are mainly found on the TiO 2 crystals surface [9], films grown via SCBD could contain a noteworthy amount of native defects because of the high surface to volume ratio of the clusters seeding the supersonic beam.…”

Influence of aqueous aging on surface properties of plasma sprayed oxide coatings

“…All these studies confirmed that the plasma sprayed TiO 2 is chemically stable, even though the material contains defects like oxygen vacancies [26]. Water adsorption studies [27][28][29][30][31] have shown that the surface defects (oxygen vacancies) are removed as a result of so called "healing" when defective TiO 2 is exposed to water even at high vacuum conditions and the surface hydroxyl groups are formed. Thus the presence of oxygen vacancies in the bulk material do not influence the chemical stability of the plasma sprayed TiO 2 .…”

“…For example, there are numerous comprehensive reviews about surface acidity of a wide selection of different oxides [14][15][16]. In addition, dissolution behaviour of traditional oxides relevant in this study, γ -Al 2 O 3 , Cr 2 O 3 and TiO 2 are well characterized [17][18][19][20][21][22][23][24][25].…”