Photoelectron spectroscopy of nanocrystalline anatase TiO2 films

Orendorz, Adam; Wüsten, J.; Ziegler, Christiane; Gnaser, Hubert

doi:10.1016/j.apsusc.2005.02.002

Cited by 70 publications

(51 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The area of the minor component versus the total area of the O 1s peak is 0.21 at 25 Ž C and 0.12 at 525 Ž C. This indicates thermal decomposition of the surface OH at 525 Ž C, consistent with the literature. [24] The minor component at 531. 4 …”

Section: Resultsmentioning

confidence: 99%

“…No nitrogen was found, indicating that the trapped NO is either not on the surface but is rather in the 'bulk', consistent with our ESR assignment, [22] or its concentration is below the detection limit of XPS due to the small Scofield cross-section of nitrogen. [35] XPS studies of the in situ annealed and defected nanocrystalline anatase [24,25] have been reported, but no publications are available on Ag supported on titania. We have performed the study to determine whether any decomposition or loss of surface atoms occurs in the Ag/titania sorbent upon in situ thermal annealing, as measured by the temperature-programmed XPS.…”

Section: Resultsmentioning

confidence: 99%

“…[24,25] The nanocrystalline anatase is stable in UHV, but the defects, such as Ti 3C , can be created by ion sputtering. [24] The thermal behavior of the nanocrystalline titania with the supported metals and metal oxides is much less studied. The surface of the Ag/titania nanocrystalline photocatalyst and defects upon introduction of the Ag dopant was studied by XPS [26] ; however, the thermal stability of such materials was not reported.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania

Samokhvalov

Duin

Nair

et al. 2010

Surface & Interface Analysis

View full text Add to dashboard Cite

aThe Ag/titania sorbent for the ultradeep desulfurization of liquid fuels was characterized by electron spin resonance and was found to contain nearly the stoichiometric titania, without significant concentration of Ti 3+ or the reactive oxygen species. The surface chemical reactions of thiophene adsorbed on the Ag/titania were studied by temperature-programmed XPS from 25 to 525• C upon in situ thermal annealing in high vacuum and in situ oxidation by oxygen gas. The titania support is not chemically reactive under those conditions. Silver oxide in the Ag/titania sorbent is converted to Ag 2 S without formation of the transient surface sulfates or sulfites and is further oxidized by molecular oxygen.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania

Samokhvalov

Duin

Nair

et al. 2010

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…The important parameter for the observation of good ohmic contact in the I -V characteristic is due to the proper matching of the work functions between the silver electrode and the TiO 2 thin film. The TiO 2 thin film has a work function of around 4.4 eV [34]. The work function of Ag is 4.3 eV [35].…”

Section: Optical Propertiesmentioning

confidence: 99%

Structural and optical properties of electrohydrodynamically atomized TiO2 nanostructured thin films

et al. 2012

View full text Add to dashboard Cite

In this paper, we report an alternate technique for the deposition of nanostructured TiO 2 thin films using the electrohydrodynamic atomization (EHDA) technique using polyvinylpyrrolidone (PVP) as a stabilizer. The required parameters for achieving uniform TiO 2 films using EHDA are also discussed in detail. X-ray diffraction results confirm that the TiO 2 films were oriented in the anatase phase. Scanning electron microscope studies revealed the uniform deposition of the TiO 2 . The purity of the films is characterized by using Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS), confirming the presence of Ti-O bonding in the films without any organic residue. The optical properties of the TiO 2 films were measured by UV-visible spectroscopy, which shows that the transparency of the films is nearly 85% in the visible region. The current-voltage (I -V ) curve of the TiO 2 thin films shows a nearly linear behavior with 45 m cm of electrical resistivity. These results suggest that TiO 2 thin films deposited via the EHDA method possess promising applications in optoelectronic devices.

show abstract

“…In general, two kinds of ways to produce titanium oxide have emerged. One is synthesis of TiO 2 nano-particles, which includes gas-phase synthesis, solution-phase synthesis, 2) chemical vapor depostion 3,4) sol-gel method, [5][6][7] and so on. Although powdered TiO 2 allows the photocatalytic reaction to occur to a larger extent which is attributed to the presence of more different reactive sites, it becomes inapplicable in practice because of the contamination and reclamation raised by the powder suspensions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Microstructure of Titanium Sheet on the Photocatalytic Activity of Its Oxide Film

2007

View full text Add to dashboard Cite

Titanium oxide film was formed by thermal oxidation directly on titanium sheet. Pretreatments on titanium sheet were carried out using annealing in Argon at 873 K, 973 K and 1073 K for 5 min, 30 min and 100 min, respectively. Photocatalytic performance of titanium oxide film was examined by measuring the degradation of methylene blue. The crystallographic orientation distribution of titanium sheet was analyzed by SEM/EBSP technique whereas the crystalline structure of titanium oxide film was characterized by XRD. Development of recrystallization texture on titanium sheet gained during the annealing, in which stored energy was lowered, was proved to facilitate formation of the preferable oxide film with high photocatalytic property during oxidation. However, grain size of titanium sheet was found to be another important and effective factor since grain boundaries were testified to be the channels for the diffusion of oxygen in the thermal oxidation reaction. Grain coarsening of titanium sheet is probably a detriment to high photocatalytic activity of its oxide film.

show abstract

Photoelectron spectroscopy of nanocrystalline anatase TiO2 films

Cited by 70 publications

References 18 publications

An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania

An in situ temperature‐programmed XPS study of the surface chemical reactions of thiophene with Ag/titania

Structural and optical properties of electrohydrodynamically atomized TiO2 nanostructured thin films

Effect of Surface Microstructure of Titanium Sheet on the Photocatalytic Activity of Its Oxide Film

Contact Info

Product

Resources

About