The Ag Influence on the Surface States of TiO2, Optical Activity and Its Cytotoxicity

Nanocomposites Based on Cerium, Lanthanum, and Titanium Oxides Doped with Silver for Biomedical Application

“…The most intense band is shifted in the high-frequency side from 143 to 154 cm −1 compared to TiO 2 , while its half-width (FWHM) increases from 10 to 25 cm −1 compared to [23]. It is the lattice deformation, and reduction in the size of crystallites and nanoparticles [21] that have a strong influence on the shear, and expansion of the peaks as in studies [27,30,32]. To compare the Raman spectrum of TiO2 powder, the bands corresponding to scattering by phonons of the structural phase of anatase are observed at 142, 196, 513 and 636 cm −1 [27].…”

“…It is the lattice deformation, and reduction in the size of crystallites and nanoparticles [21] that have a strong influence on the shear, and expansion of the peaks as in studies [27,30,32]. To compare the Raman spectrum of TiO2 powder, the bands corresponding to scattering by phonons of the structural phase of anatase are observed at 142, 196, 513 and 636 cm −1 [27]. The incorporation of precious metals with a concentration of 4% (Ag, Au) helps to reduce the intensity and broaden the peaks at 142-147, 510-520, and 630-640 cm −1 (Figure 3c).…”

“…When the initial concentration of argentum is high and silver clusters are loaded the surface of CeO 2 their appearance leads to a decrease in the recombination force between an electron and holes. Thus, metallic clusters can enhance the optical, antiviral, and bactericidal activity of oxide nanopowders [24][25][26][27][28][29].…”

“…To compare the Raman spectrum of TiO 2 powder, the bands corresponding to scattering by phonons of the structural phase of anatase are observed at 142, 196, 513 and 636 cm −1 [27]. The incorporation of precious metals with a concentration of 4% (Ag, Au) helps to reduce the intensity and broaden the peaks at 142-147, 510-520, and 630-640 cm −1 (Figure 3c).…”

“…The incorporation of precious metals with a concentration of 4% (Ag, Au) helps to reduce the intensity and broaden the peaks at 142-147, 510-520, and 630-640 cm −1 (Figure 3c). In comparison to TiO 2 and TiO 2 -Ag, as well as doped TiO 2 synthesized from metatitanic acid [27], the spectrum for TiO 2 -Au is characterized by the appearance of peaks in the range of 220-300 cm −1 (multiphonon scattering from TiO 2 ) and 780-800 cm −1 [30][31][32]. Probable heterojunction between TiO 2 and Au (removal of the effective Schottky barrier) for efficient electronic transitions between metal and oxide allows increasing antibacterial properties, etc.…”