Photoluminescence properties of TiO2 nanofibers

Structural, Photoluminescence and Electron Density Distribution Analysis of Rutile Phase TiO2

“…The intensity of both excitation and emission spectra gradually increased and reached the maximum intensity for single phased rutile TiO 2 . This may be due to the sintering temperature which improved the surface states by enhancing the number of surface defects and improved the crystallinity of TiO 2 samples [27]. In Fig.…”

Facile synthesis of SiO 2 @TiO 2 hybrid NPs with improved photocatalytic performance

“…It was dried at 70°C overnight before being used for solvothermal reactions. 4 (1 mmol) was dissolved in 52 ml of ethanol to form a thin milky suspension under mild stir. Then, 240 mg of the prepared silica sphere was dispersed in another 4 ml of ethanol by ultrasonification.…”

“…As an important wide bandgap (3.2 eV) semiconductor, anatase titanium dioxide (TiO 2 ) is one of the most attractive inorganic materials, because of its special physical and chemical properties and wide applications in photocatalytic materials [1], solar cells [2], gas sensors [3], and luminescent materials [4]. The photocatalytic properties of TiO 2 are greatly affected by the morphology, surface area, and the size distribution [5, 6].…”

Visible light photoluminescence in TiO2/CdS nanopowders synthesized by sol-gel route: effect of gel aging time

“…The all visible emission bands can be associated to the radiative recombination at the surface defects sites such as oxygen vacancy and hydroxyl groups which are the dominant trapped sites for nano-powders fabricated by low-temperature sol-gel. One set visible emissions at 2.3 and 1.95 eV are attributed to the deexcitation from the lower levels of oxygen vacancies associated with Ti 3+ in anatase lattice to the ground state [12,14]. The sub-band at 2.1 eV is due to the deexcitation from lower levels in Ti 3+ 3d states of TiO 2 lattice to the deep levels created by OH − group [12].…”

“…For visible-light photoactive nano-sized TiO 2 /CdS composites [6][7][8], as well as for the visible photoactive TiO 2doped materials [9,10], the direct correlation has been often found between the increased photoactivity and decreased radiative recombination in the visible range. Visible-light emission, related to the radiative recombination in nanosized TiO 2 is mainly attributed to (I) the self-trapped excitons, (II) oxygen vacancies and (III) surface states [11][12][13][14]. For CdS nanocrystals and nanoparticles, visible PL includes a number of emission bands associated with both surface electron states and states of complex defect centers [15][16][17][18].…”