Cathodoluminescence of TiO2 powders

Sublacustrine hydrothermal seeps and silicification of microbial bioherms in the Ediacaran Oued Dar'a caldera, Anti‐Atlas, Morocco

“…These emission bands reflect several anomalies, such as oxygen‐deficient centres (290 to 310 nm), intrinsic emissions and carbon impurities (415 to 420 nm), intrinsic defects and extrinsic impurities of silica (450 nm), extrinsic emission by Al substitutions (500 nm), and oxygen vacancy and lattice defects (620 to 655 nm; Götze et al ., ; Götze, ). Bands at 490 nm and 510 to 520 nm can also be strengthened by incorporation of TiO 2 (Devilliers & Mahé, ; Mikhailov & Yuryev, ), described above as a distinct accessory mineral in these hydrothermal precipitates (Fig. B).…”

The Role of Lattice Defects on the Optical Properties of TiO2 Nanotube Arrays for Synergistic Water Splitting

“…Mikhailov et al have proposed that the CL spectrum of TiO 2 particles in the 300− 1200 nm range is composed of multiple bands. 23 Ho et al found that by altering the annealing conditions of TiO 2 , the CL band intensity can be tuned. 24,25 Naldoni et al demonstrated that black TiO 2 powder samples show greater CL intensity bands compared to pristine TiO 2 due to different radiative transitions, which are related to OV intragap states or to the self-trap exciton.…”

“…Spectroscopic techniques as a powerful tool are often used to detect OVs in metal oxides. , Cathodoluminescence (CL) spectroscopy allows to elucidate the emission spectral bands caused by different transitions such as the band edge, OVs, surface and interstitial states, and color centers. − Therefore, CL techniques were extensively used to study the emissions associated with OVs in metal oxides such as CeO 2 , Y-doped ZrO 2 , and TiO 2 . ,− Analysis of the emission properties of the TiO 2 sample is especially relevant since these contain information about possible lattice defects that are essential for the design of efficient photocatalysts. Mikhailov et al have proposed that the CL spectrum of TiO 2 particles in the 300–1200 nm range is composed of multiple bands . Ho et al found that by altering the annealing conditions of TiO 2 , the CL band intensity can be tuned. , Naldoni et al demonstrated that black TiO 2 powder samples show greater CL intensity bands compared to pristine TiO 2 due to different radiative transitions, which are related to OV intragap states or to the self-trap exciton .…”