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Structural characterization and photocatalytic behaviors of doped CeO2 nanoparticles

“…3 presents the FT-IR of CeO 2 nanoparticles and the doped CeO 2 nanoparticles in the wave number range from 4000 to 400 cm −1 . The absorption bands around 3400 and 1620 cm −1 observed in all spectra are attributed to the stretching mode of water and hydroxyl [23,24]. The peaks at 846,1055, and 1340 cm −1 are attributed to the vibrations associated with the incoordination of the adsorbed NO 3 −1 ions [25].…”

Synthesis of bimodally porous titania powders by hydrolysis of titanium tetraisopropoxide

“…Weaker peaks are also observed at 1440 and 1355 cm −1 and at 1160 and 1063 cm −1 , which are associated with the bending of C-H bonds and C-O stretching in TTIP, respectively. 25 This spectrum indicates that a significant amount of organic components remains in the R5 powder. However, the organic peaks disappear in the spectrum for 400°C and this is ascribed to the oxidation of organic components, as confirmed by DTA in Fig.…”

“…Figure 3 shows IR spectra of the R5 powder heattreated at increasing temperatures. The peaks around 3410 and 1640 cm −1 correspond to the OH stretching and bending, 25 respectively. The intensity of these absorption bands decreases with increasing calcination temperature.…”

Preparation and Characterization of Core/Shell-type Ag/Chitosan Nanoparticles with Antibacterial Activity

“…The absorption bands at 3430 and 1630 cm −1 or so, as observed in all spectra, are attributed to the stretching mode of hydroxyl. 20,21 The absorption peak of the carbonyl group at about 1690 cm −1 in EDTA shifts to 1630 cm −1 in the spectrum of the CS-EDTA nanoparticles and the core/shelltype Ag/CS nanoparticles, as the carboxyls in EDTA molecules are ionized and overlapped with bending vibration of hydroxyl. 22 At the same time, the amino band (at 1540 cm −1 ) in the spectrum of pure chitosan disappears in the CS-EDTA nanoparticles and the core/shell-type Ag/CS nanoparticles, suggesting that the amino groups are in their protonated state whose absorption peak (around 1620 cm ).…”