The Interaction of O₂, NO, and N₂O with Surface Defects of Dispersed Titanium Dioxide

Electron structure of TiO 2 composite films with noble metal nanoparticles

“…4, within the bandgap of TiO 2 film at the energy 1.3 eV, there is a band that, according to the ultraviolet photoelectron spectroscopy study [19], can be attributed to absorption by F 2+ centers. At the energies 1.57 and 1.75 eV, there are two extrema that are supposedly associated with donor levels arising due to the presence of interstitial Ti atoms in tetrahedral (і т (Ti)) and octahedral (і о (Ti)) pores of the tetragonal lattice in TiO 2 anatase, respectively [17].…”

“…The energy levels that correspond to F and F + are occupied by electrons, and therefore they can act as color centers. The band at 2.0 eV is attributed to formation of Ti 3+ impurity centers [3,19]. At the same time in tetrahedral (і т (Ti)) and octahedral (і о (Ti)) pores of the tetragonal lattice of ТіО 2 anatase, there can possibly exist interstitial Ti atoms that create additional energy states in the bandgap of ТіО 2 [17].…”

“…At the energies 1.57 and 1.75 eV, there are two extrema that are supposedly associated with donor levels arising due to the presence of interstitial Ti atoms in tetrahedral (і т (Ti)) and octahedral (і о (Ti)) pores of the tetragonal lattice in TiO 2 anatase, respectively [17]. At the energy 1.95 eV, there is an extremum that corresponds to absorption of Ti 3+ ions [19]. The extremum at the energy 2.7 eV can be attributed to the presence of oxygen vacancies in TiO x oxide of non-stoichiometric composition.…”

“…The extremum at the energy 2.7 eV can be attributed to the presence of oxygen vacancies in TiO x oxide of non-stoichiometric composition. These vacancies correspond to the F color centers [3,19].…”

Combinatorial doping of TiO2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

“…44 It was also reported that similar absorption spectra in the visible region are found in reduced TiO 2 samples with observed absorption spectra being the sum of overlapping absorption bands with the maxima at 2.81 eV and 2.55 eV, which correlate with oxygen vacancies. 46,47 The metal-ion dopants used in this study have different valence states than Ti The properties of 0.3 at.% MM-TiO 2 samples are summarized in Table I Table I along with the BET surface areas. Figure 3(a) shows that a rutile phase of Cr or Pt singly-doped TiO 2 was well maintained in doubly-doped Pt(IV)-Cr-TiO 2 samples.…”