The Application of UV‐Visible‐NIR Spectroscopy to Oxides

Indoor illumination: A possible pitfall in toxicological assessment of photo-active nanomaterials

“…Conversely, sulphation and large aggregation appeared related to an enhanced absorption of PC105 in the high energy visible range. Finally, as expected, the presence of rutile in P25 resulted in a shift of the inter-band transition edge toward longer wavelength [39].…”

“…All samples appeared, as expected, opaque to UV radiation and transparent to visible light ( Figure S2 in SI). The Kubelka-Munk vs. wavelength spectra exhibited the typical absorption edge due to the valence-to-conduction band transition [39]. As expected, the absorption edge of P25 (anatase:rutile  80:20 by weight) is located at longer wavelength with respect the pure anatase materials, because of the narrower inter-band energy gap of rutile [40].…”

Synthesis, Characterization, and Photocatalytic Tests of N-Doped Zinc Oxide: A New Interesting Photocatalyst

“…The band gap of all the samples was calculated by linearization of the plot reporting ( ℎ]) 2 versus ℎ] typical of direct band gap transitions for ZnO and Ce-ZnO through the Tauc plot from DRS measures [42]. Bare samples (namely, ZnO St and ZnO MW) show a band gap of 3.28 eV, while for N-doped ZnO (namely, N-ZnO St and N-ZnO MW) it is 3.25 eV, implying that the doping process does not induce a modification in the material band gap.…”

Fluorine- and Niobium-Doped TiO2: Chemical and Spectroscopic Properties of Polycrystalline n-Type-Doped Anatase

“…(Table 1), it is possible to deduce the Fermi level energy (E F ) for the whole set of samples 49 (see Table 2). It is worth to note that the Energy gap has been obtained via a method which implicates a certain degree of approximation 51 . The absolute E F value is obviously quite dependent on the binding energy range used for the linear interpolation of the slope of the valence band 52 , however this approach is quite reliable if used, as in the present case, to…”