Thermal and photo-stimulated desorption of chemisorbed oxygen molecules from titanium dioxide surfaces

Yanagisawa, Yasunori; Ota, Yasutomo

doi:10.1016/0039-6028(91)90619-4

Cited by 45 publications

(37 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was found that a small amount of H 2 could be evolved under UV light irradiation, whereas no O 2 evolution was detectable. These phenomena can be related to the physisorbed or chemisorbed of O 2 molecules on the surface of the photocatalyst particles, just as that found on TiO 2 [11,12]. Taking into the band gap energy accounted from the UV-VIS diffuse reflectance spectrum, the band structure of CsLaSrNb 2 NiO 9 was proposed and schematically illustrated in figure 4.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic properties of a novel layered photocatalyst CsLaSrNb2NiO9

Yao

2006

Catal Lett

View full text Add to dashboard Cite

A new visible-light-driven photocatalyst CsLaSrNb 2 NiO 9 based on the 2-D layered perovskite crystal structure was prepared by using the solid-state method. Photocatalytic H 2 evolution from the aqueous CH 3 OH solution was achieved on the photocatalysts CsLaSrNb 2 NiO 9 under UV or visible light irradiation. A possible electronic band structure of CsLaSrNb 2 NiO 9 was proposed in regard to the complicated photocatalytic and photophysic properties.

show abstract

Section: Resultsmentioning

confidence: 99%

Photocatalytic properties of a novel layered photocatalyst CsLaSrNb2NiO9

Yao

2006

Catal Lett

View full text Add to dashboard Cite

show abstract

“…Apart from photosplitting of water, other photochemical activities of TiO 2 include adsorption and desorption of O 2 , CO 2 , CO, halides, or various organic compounds on nanostructured TiO 2 surface [359][360][361][362][363][364][365][366][367][368][369][370][371][372][373] and photo-oxidation/reduction of molecular nitrogen, NO 2 , NH 3 , CO 2 , or halides. [374][375][376][377][378][379][380][381][382][383][384][385][386][387][388][389] Photocatalysis being a surface phenomenon, surface area is very important in determining the amount of reaction sites, and charge carriers have to be utilized properly to improve their ability to initiate surface reactions.…”

Section: Surface Modification Of the Tio 2 Nanostructurementioning

confidence: 99%

The design, fabrication, and photocatalytic utility of nanostructured semiconductors: focus on TiO2-based nanostructures

Banerjee¹

2011

NSA

215

View full text Add to dashboard Cite

Recent advances in basic fabrication techniques of TiO2-based nanomaterials such as nanoparticles, nanowires, nanoplatelets, and both physical- and solution-based techniques have been adopted by various research groups around the world. Our research focus has been mainly on various deposition parameters used for fabricating nanostructured materials, including TiO2-organic/inorganic nanocomposite materials. Technically, TiO2 shows relatively high reactivity under ultraviolet light, the energy of which exceeds the band gap of TiO2. The development of photocatalysts exhibiting high reactivity under visible light allows the main part of the solar spectrum to be used. Visible light-activated TiO2 could be prepared by doping or sensitizing. As far as doping of TiO2 is concerned, in obtaining tailored material with improved properties, metal and nonmetal doping has been performed in the context of improved photoactivity. Nonmetal doping seems to be more promising than metal doping. TiO2 represents an effective photocatalyst for water and air purification and for self-cleaning surfaces. Additionally, it can be used as an antibacterial agent because of its strong oxidation activity and superhydrophilicity. Therefore, applications of TiO2 in terms of photocatalytic activities are discussed here. The basic mechanisms of the photoactivities of TiO2 and nanostructures are considered alongside band structure engineering and surface modification in nanostructured TiO2 in the context of doping. The article reviews the basic structural, optical, and electrical properties of TiO2, followed by detailed fabrication techniques of 0-, 1-, and quasi-2-dimensional TiO2 nanomaterials. Applications and future directions of nanostructured TiO2 are considered in the context of various photoinduced phenomena such as hydrogen production, electricity generation via dye-sensitized solar cells, photokilling and self-cleaning effect, photo-oxidation of organic pollutant, wastewater management, and organic synthesis.

show abstract

“…So far, much of the research on TiO 2 has focused on surface defects and their possible effect on the adsorption and dissociation of small molecules, because such defects are believed to be active sites in catalytic and photocatalytic processes. [65][66][67][68][69][70][71][72] Oxygen vacancy defects are formed easily by annealing above 800 K, which makes the TiO 2 surface more reactive than other nonreducible oxides. The cleaning process of the TiO 2 (110) surface by heating in UHV created a reduced bulk and resulted in semiconducting properties, reflected in a permanent color change from transparent to blue.…”

Section: Diffusion/segregation Of Oxygen On the Tio 2 (110) Surfacementioning

confidence: 99%

“…Oxygen photodesorption studies of powdered TiO 2 and TiO 2 (110) showed that recombination of adsorbed O − 2 with photogenerated holes results in O 2 desorption without mixing with lattice oxygen atoms. 69,70 Water is dissociatively adsorbed on TiO 2 (110) but its probability is independent of the coverage of surface oxygen defect sites. In this context, it is clear that knowledge of the dynamical behavior of hydrogen, oxygen, and their complexes on the TiO 2 (110) surface is of crucial importance for a better understanding of catalytic and photocatalytic properties of TiO 2 .…”

Section: Diffusion/segregation Of Oxygen On the Tio 2 (110) Surfacementioning

confidence: 99%

See 1 more Smart Citation

Femtosecond Electron Dynamics on Solid Surfaces Probed by Ion Scattering and Stimulated Desorption of Secondary Ions

Souda

2000

Int. J. Mod. Phys. B

View full text Add to dashboard Cite

In this article, the mechanism of electronic transitions during scattering and stimulated desorption of ions from solid surfaces is discussed. Reactive ions such as H + and O + experience transient chemisorption during scattering from solid surfaces. These ions are neutralized almost completely on metal and semiconductor surfaces due to the band effect on resonance neutralization. The neutralization probability of H + is suppressed considerably on highly ionic compound surfaces and is dependent on the target species due to the formation of the bound state (on cations) or the surface molecule (on anions). Because of this, the H − ion is formed preferentially on the cationic site rather than on the anionic site. The noble-gas ions are neutralized via the Auger process so that the neutralization probability is basically independent of the band effect. The stimulated desorption of secondary O + and F + ions does not exhibit the band effect. This is because the desorption is initiated by the core hole state, which is followed by ionization via the intra-atomic Auger decay after breakage of the chemisorptive bond. The stimulated desorption of H + might occur from the valence holes but is more likely to be caused by the core-excited OH species via the interatomic Auger decay. The core hole is created not only by the electron and photon irradiation but also by the energetic ion bombardment due to the nonadiabatic transition of the primary ion's core hole. Also presented are some applications of ion scattering and ion stimulated desorption for the analysis of the diffusion/segregation dynamics of oxygen and hydrogen on solid surfaces.

show abstract

Thermal and photo-stimulated desorption of chemisorbed oxygen molecules from titanium dioxide surfaces

Cited by 45 publications

References 8 publications

Photocatalytic properties of a novel layered photocatalyst CsLaSrNb2NiO9

Photocatalytic properties of a novel layered photocatalyst CsLaSrNb2NiO9

The design, fabrication, and photocatalytic utility of nanostructured semiconductors: focus on TiO2-based nanostructures

Femtosecond Electron Dynamics on Solid Surfaces Probed by Ion Scattering and Stimulated Desorption of Secondary Ions

Contact Info

Product

Resources

About