Surface electron structures and mechanism of nonradiative transitions on crystalline TiO2 nanoparticles

Synergistic effect of composite template and La-doping on microdynamic behavior of photogenerated carriers in mesoporous nano-TiO2

“…According to Ref. [30] and the present experimental results, there was a larger increase in the shoulder peak than that of the main-band-gap SPV response of nano-TiO 2 at 350 nm as seen in Fig. 5(b1); by using the abscissa of the largest external tangent of this band, the photoelectric thresholds of the main-band-gap SPV response of the samples were found to be about 3.2 eV, and the shoulder peak response was closely related to the kind of surface states of anatase.…”

Photo-oxidation of gas-phase cyclohexane species over nanostructured TiO2 fabricated by different strategies

“…4 shows the surface photovoltage spectra of P25, WT, STH, and STW. All the samples had an absorption band from 300 nm to 410 nm due to the transition of the O 2− antibonding orbital to the lowest empty orbital of Ti 4+ [17]. WT, STH and STW exhibited blue shift, which should be caused by their reduced grain sizes after modification, as indicated by the XRD results.…”

Cooperative effect of La-doping and template on surface photoelectron characteristics of mesoporous nano-TiO2

“…The PA spectra of the samples were normalized by the PA signals of carbon black powders. In the present work, the PA spectroscopy measurements were first conducted under different modulation frequencies, ranging from 20 to 80 Hz, to confirm that the detected PA signals were only from the surface and subsurface of TiO 2 nanoparticles [24].…”

“…According to Ref. [24] transition Ti 3 + 3d(s2) -Ti 4 + 3d may be stimulated only by photon (hu Z2.95 eV), in which the levels of surface state Ti 3 + 3d(s2) is closely related to the transformation of anatase to rutile-like phase. The SPV response peak of sample 1# at 422 nm (2.94 eV) was generally corresponding to this conclusion.…”