Temperature effects during Ostwald ripening on structural and bandgap properties of TiO2 nanoparticles prepared by sonochemical synthesis

González-Reyes, Leonardo; Hernández-Pérez, I.; Arceo, Lucia Díaz-Barriga; Dorantes-Rosales, Héctor J.; Arce-Estrada, E.M.; Suárez-Parra, R.; Cruz-Rivera, J.J.

doi:10.1016/j.mseb.2010.06.004

Cited by 46 publications

(14 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TiO 2 has been debated to have direct and indirect bandgaps by several groups [51][52][53][54][55]. Large variation in the bandgap values have also been reported which is mainly attributed to the degree of hydroxylation [56], thermal treatment [57], ionic vs. covalent character in the bonding [58] and the degree of disorder in the nanoparticles [56]. Further the synthesis method play significant influence on the values with the wet chemical methods leading to lower E g .…”

Section: Resultsmentioning

confidence: 99%

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Das

Ilaiyaraja

Mocherla

et al. 2016

Solar Energy Materials and Solar Cells

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Das

Ilaiyaraja

Mocherla

et al. 2016

Solar Energy Materials and Solar Cells

View full text Add to dashboard Cite

“…The increasing of active sites on the surface can occur through the reduction of the particle size or an increase of the specific surface area [31,94]. The crystallinity can be improved with the calcination temperature and with other preparation steps such as the use of ultrasound irradiation [43,[95][96][97].…”

Section: Relevant Parameters Of N-doped Tio 2 Photoactivitymentioning

confidence: 99%

N–TiO2 Photocatalysts: A Review of Their Characteristics and Capacity for Emerging Contaminants Removal

Gomes

Lincho

Domingues

et al. 2019

Water

142

View full text Add to dashboard Cite

Titanium dioxide is the most used photocatalyst in wastewater treatment; its semiconductor capacity allows the indirect production of reactive oxidative species. The main drawback of the application of TiO2 is related to its high band-gap energy. The nonmetal that is most often used as the doping element is nitrogen, which is due to its capacity to reduce the band-gap energy at low preparation costs. There are multiple and assorted methods of preparation. The main advantages and disadvantages of a wide range of preparation methods were discussed in this paper. Different sources of N were also analyzed, and their individual impact on the characteristics of N–TiO2 was assessed. The core of this paper was focused on the large spectrum of analytical techniques to detect modifications in the TiO2 structure from the incorporation of N. The effect of N–TiO2 co-doping was also analyzed, as well as the main characteristics that are relevant to the performance of the catalyst, such as its particle size, surface area, quantum size effect, crystalline phases, and the hydrophilicity of the catalyst surface. Powder is the most used form of N–TiO2, but the economic benefits and applications involving continuous reactors were also analyzed with supported N–TiO2. Moreover, the degradation of contaminants emerging from water and wastewater using N–TiO2 and co-doped TiO2 was also discussed.

show abstract

“…After this time, the reaction mixture was exposed to ultrasound irradiation at 20 kHz for 50 min. After ultrasound treatment, the chemical solvents were evaporated using a magnetic mixer-heater plate at 60 • C up to the moment the remnant material was liquid-free and had a dry appearance [23]. Here, we denote these TiO 2 nanoparticles from sonochemical synthesis as the as-prepared sample.…”

Section: Tio 2 -Anatase Synthesis Of As-prepared Sample By Sonochemicmentioning

confidence: 99%

“…Here, the formation of anatase starts with a size of 4.2 ± 1.5 nm, and experiences eventual Ostwald ripening. This is a phenomenon observed in solid solutions that describes the change of an inhomogeneous structure over time; i.e., small crystals or sol particles dissolve, and redeposit onto larger crystals [23]. In this case, the hydrothermal process is considered, such as in a closed bath system, and the supersaturation drops as clusters nucleate and grow, causing an increase in the stable critical nucleus size.…”

Section: Surface Morphologymentioning

confidence: 99%

“…To date, most studies have focused on the effects of hydrothermal temperature and reaction time on the structural properties. However, there are few previous studies reporting the role of particle size on the thermal stability of TiO 2 nanoparticles under hydrothermal conditions [20][21][22][23][24]. The formation mechanism of TiO 2 heterostructures has not yet been clarified.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Atomic-Scale Investigation on the Evolution of Tio2-Anatase Prepared by a Sonochemical Route and Treated with NaOH

et al. 2020

View full text Add to dashboard Cite

To date, the formation mechanisms of TiO2, as well as its heterostructures, have not been clarified. Moreover, detailed research on the transition from a tetragonal anatase phase to the monoclinic phase of the TiO2(B) phase and their interface structure has been quite limited until now. In the present study, we report on the sonochemical synthesis of TiO2-anatase with a crystallite size of 5.2 ± 1.5 nm under different NaOH concentrations via the hydrothermal method. The use of alkaline solution and the effect of the temperature and reaction time on the formation and structural properties of TiO2-anatase nanopowders were studied. The effects of NaOH concentration on the formation and transformation of titanate structures are subject to thermal effects that stem from the redistribution of energy in the system. These mechanisms could be attributed to three phenomena: (1) the self-assembly of nanofibers and nanosheets, (2) the Ostwald ripening process, and (3) the self-development of hollow TiO2 mesostructures.

show abstract

Temperature effects during Ostwald ripening on structural and bandgap properties of TiO2 nanoparticles prepared by sonochemical synthesis

Cited by 46 publications

References 19 publications

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

Influence of surface disorder, oxygen defects and bandgap in TiO2 nanostructures on the photovoltaic properties of dye sensitized solar cells

N–TiO2 Photocatalysts: A Review of Their Characteristics and Capacity for Emerging Contaminants Removal

Atomic-Scale Investigation on the Evolution of Tio2-Anatase Prepared by a Sonochemical Route and Treated with NaOH

Contact Info

Product

Resources

About