Abstract:Pure and Ce-doped TiO2 nanoparticles were prepared by facile sol–gel method. Structural, microstructural and optical properties were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL) and UV–Vis spectra. XRD analysis confirms the formation of pure anatase tetragonal TiO2 phase with a preferred orientation along (101) direction and that the lattice constants increased with increasing the Ce doping level. The UV–vis reflectance spectra showed that ceriu… Show more
“…Because Ti 3+ ions are usually produced by the transfer of electrons trapped in oxygen vacancies to neighboring Ti atoms, Ti 3+ ions in TiO 2 also indicate the presence of oxygen vacancies in the material. Using standard Kroger-Vink notation [ 29 ], the equilibrium in Eq. (12) can describe the formation of the oxygen vacancies at increased temperatures: Figure 6 EDS Spectra for samples annealed (a) 450 °C, (b) 550 °C, (c) 650 °C, and (d)750 °C annealing temperatures.…”
Titanium dioxide (TiO
2
) nanoparticles (NPs) were produced by simple sol-gel technique and annealed for 2 h in air. The impact of annealing temperature on the physical, morphological, photocatalytic, and optical properties was studied. X-ray diffraction (XRD) measurements proved that a gradual phase change from anatase to rutile occurred with increased annealing temperature. The crystal structures of the NPs were found to change at different temperatures; anatase phase at 450 °C, mixed-phase (anatase/Rutile) at 550–650 °C, and rutile phase at 750 °C. The rise in the annealing temperature improved the crystallinity of the NPs. The crystal and grain size of the NPs increased with the annealing temperature hence reducing the specific surface area due to the condensed boundaries between subunits of the NPs. As per the Kubelka-Munk equation, the bandgap reduced as the temperature elevated. The photocatalytic activity of the NPs was higher in the anatase/rutile mixed-phase than in the single anatase and rutile phase. Experimental results indicated that annealing temperature could effectively change the properties of the TiO
2
NPs.
“…Because Ti 3+ ions are usually produced by the transfer of electrons trapped in oxygen vacancies to neighboring Ti atoms, Ti 3+ ions in TiO 2 also indicate the presence of oxygen vacancies in the material. Using standard Kroger-Vink notation [ 29 ], the equilibrium in Eq. (12) can describe the formation of the oxygen vacancies at increased temperatures: Figure 6 EDS Spectra for samples annealed (a) 450 °C, (b) 550 °C, (c) 650 °C, and (d)750 °C annealing temperatures.…”
Titanium dioxide (TiO
2
) nanoparticles (NPs) were produced by simple sol-gel technique and annealed for 2 h in air. The impact of annealing temperature on the physical, morphological, photocatalytic, and optical properties was studied. X-ray diffraction (XRD) measurements proved that a gradual phase change from anatase to rutile occurred with increased annealing temperature. The crystal structures of the NPs were found to change at different temperatures; anatase phase at 450 °C, mixed-phase (anatase/Rutile) at 550–650 °C, and rutile phase at 750 °C. The rise in the annealing temperature improved the crystallinity of the NPs. The crystal and grain size of the NPs increased with the annealing temperature hence reducing the specific surface area due to the condensed boundaries between subunits of the NPs. As per the Kubelka-Munk equation, the bandgap reduced as the temperature elevated. The photocatalytic activity of the NPs was higher in the anatase/rutile mixed-phase than in the single anatase and rutile phase. Experimental results indicated that annealing temperature could effectively change the properties of the TiO
2
NPs.
“…The configuration of Ce 3+ is [Xe]4f 1 5d 0 6s 0 of which its f-orbital has unoccupied. When Ce 3+ was doped in the SiO 2 -TiO 2 matrix, the 4f electronic configuration of Ce which allows electron transition from 2p levels of oxygen (valance band -VB) to 4f levels of Cerium and 2p levels of Oxygen to 3d levels of Titanium (conduction band -CB) [17][18][19][20][21] . This leads to the generation of electron-hole pairs and the improvement of the visible light absorption, and visible light response.…”
The effect of Cerium on the properties of the multi-functional SiO2-TiO2:Ce3+ nanocomposite films are shown in this paper. The multi-functional SiO2-TiO2:Ce3+ nanocomposite film was synthesis by a sol-gel method and coated several layers on a glass substrate by a spin-coating technique. The bonding was indicated in the obtained film that Si-O-Si and Si-O-Ti bonding, which are characteristics that bonding in the SiO2-TiO2 matrix by the FT-IR spectrum. The TiO2 crystal in the anatase phase and SiO2 in the amorphous phase of the nanocomposite film was determined by X-ray Diffraction. When increased doping of Ce3+, the prepared films have a high transmittance in the visible light (from 84.5 to 88.3%, 400 – 800 nm), the red-shifted of the absorbance edge in UV(A) region (from 355 to 390 nm), and the optical bandgap is narrowed. Particularly, the SiO2-TiO2:6%Ce3+ film has the transmittance by 88.3% in the visible light (400 – 800 nm), absorbance in the UV(A) light (390 nm), and performance the super-hydrophilic with/without thermal and UV(A) light. Thus, the multi-functional SiO2-TiO2:6%Ce3+ nanocomposite film could have a potential to use as the protective high transmittance film to avoid the UV-A light and exhibits a super-hydrophilic on the material surface such as glasses, photovoltaic devices, window panels.
“…In addition, the optical and electrical properties of AgeTiO 2 thin films have also been investigated [6]. Furthermore, recently, CeeTiO 2 has been studied for applications in photoenergy production [7]. An important research of TiO 2 , and other semiconductor nanocrystals, is to function as host lattices for several rare earth ions.…”
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