X-ray photoelectron spectroscopy studies of indium tin oxide nanocrystalline powder

Pujilaksono, Bagas; Klement, Uta; Nyborg, Lars; Jelvestam, U.; Hill, Sven; Burgard, Detlef

doi:10.1016/j.matchar.2004.09.008

Cited by 60 publications

(34 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XPS spectrum for In3d was revealed in Fig.3d linked with the unsaturated oxygen and Clions respectively. Compared with the reported In3d 5/2 signal of metallic indium which appeared at 443.6 eV, the absence of this peak excluded the existence of metallic indium, suggesting the loaded indium existed in the oxide state [43,44]. The O1s core level peak at 530.3 eV (Fig.3f) could be ascribed to lattice oxygen in TiO 2 which also verified the existence of O-Ti-C and another peak at 532.1 eV associated to surface hydroxyl groups.…”

Section: Xps Analysiscontrasting

confidence: 64%

Indium doped and carbon modified P25 nanocomposites with high visible-light sensitivity for the photocatalytic degradation of organic dyes

Jin

Duan

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

The commercially available TiO 2 Degussa P25 was modified using a simple technique to produce a visible-light-actived indium and carbon doped P25 catalyst. The modified photocatalysts have been successfully obtained by thermal heating method. These as-obtained products were successfully characterized by X-ray diffraction (XRD), X-ray photoelectrion spectroscopy (XPS), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy respectively. The photocatalytic activities of all prepared catalysts were evaluated by the degradation of organic dyes including methylene blue (MB) and Reactive Red 4 (RR4) under visible light irradiation. As the result shown, the indium and carbon co-doped on P25 nanocomposites possessed the extended light absorption in visible light and better charge separation capability as compared to the pristine P25. The optimum loading of In 3+ ions on P25 was 15%. Moreover, 15% In 2 O 3 /C-P25 showed the highest degradation rate of organic dye, which the removal efficiency can reach over 90% after 90 minutes and the corresponding hydrogen evolution rate of 15% In 2 O 3 /C-P25 was 9 times than P25. It was concluded that the synergistic effects of In 3+ ions and carbon narrowed the band gap of TiO 2 and promoted charge separation, which played a significant role for the enhancement of photoactivity. In addition, it was observed that the photo-degradation for all catalysts followed the first order reaction kinetics. Furthermore, the influence of initial pH values on the photocatalytic degradation of MB and RR4 using 15% In 2 O 3 /C-P25 catalyst was also investigated. Finally, the stability test of photocatalysts was carried out and the photocatalytic mechanism was explained concretely.

show abstract

Section: Xps Analysiscontrasting

confidence: 64%

Indium doped and carbon modified P25 nanocomposites with high visible-light sensitivity for the photocatalytic degradation of organic dyes

Jin

Duan

et al. 2016

Applied Catalysis A: General

View full text Add to dashboard Cite

show abstract

“…The peak analysis of typical S-2 sample exhibited Sn3d 3/2 and Sn3d 5/2 of Sn 4+ in SnO 2 at 494⋅70 eV and 486⋅24 eV, respectively along with two additional peaks at 493⋅13 eV and 484⋅71 eV. These two additional peaks are due to the presence of Sn metal or Sn 2+ (Ishida et al 1993;Yamaguchi et al 2004;Pujilaksono et al 2005) as reduction of Sn 4+ by sputtering is not unlikely as oxygen may be removed from the surface during Ar + sputtering. Their full widths at half-maximum (FWHM) also suggest the existence of Sn metal or Sn 2+ of SnO in the films.…”

Section: Resultsmentioning

confidence: 96%

Surface characterization of sol-gel derived indium tin oxide films on glass

Biswas

Dua

et al. 2006

Bull Mater Sci

View full text Add to dashboard Cite

Indium tin oxide (ITO) films containing different In : Sn atomic ratios, viz. 90 : 10, 70 : 30, 50 : 50, 30 : 70, were deposited on two types of glass substrates by sol-gel spinning technique. XPS analysis of the films was done under as-received and after-sputtering conditions. The narrow spectra obtained for the Na1s, In3d, Sn3d and O1s have been discussed. Oxygen was found to exist in three chemical environments in as-received samples due to the existence of (i) environmental hydroxyl (-OH) group, (ii) crystalline ITO and (iii) amorphous ITO; but it was in two chemical environments, (ii) and (iii), after surface cleaning by sputtering. The presence of both tin metal and tin oxides was confirmed by the peak analysis of Sn3d. The In : Sn atomic ratio taken in the precursor sols did not change considerably in the case of developed films of low Sn content, but considerable change was observed in the films having high Sn content.

show abstract

“…For bcc-ITO NCs the maximum of In 3d 5/2 peak is at 444.7 eV, which is in a very good agreement with the results previously reported for bulk ITO with cubic bixbyite structure. 42 Indium 3d peaks for rh-ITO NCs are shifted to higher energies (445.2 eV for In Figure 3d shows XPS spectra of bcc-and rh-ITO NCs in the O 1s peak range. Relatively broad asymmetric peaks are recorded with maxima at ca.…”

Section: Resultsmentioning

confidence: 99%

Free Electron Concentration in Colloidal Indium Tin Oxide Nanocrystals Determined by Their Size and Structure

2010

View full text Add to dashboard Cite

We report the synthesis and separation of colloidal indium tin oxide (ITO) nanocrystals in the stable cubic bixbyite (bcc-ITO) and metastable corundum (rh-ITO) phase under identical conditions, based on the size-structure correlation. Both phases are obtained in the same reactions, with nanocrystals below ca. 5 nm in size having corundum crystal structure. This bimodal size distribution allows for the separation of the nanocrystal phases by size selective precipitation. A comparative study of bcc-ITO and rh-ITO nanocrystals reveals a dramatic difference in their optical and electrical properties. Unlike smaller rh-ITO nanocrystals, bcc-ITO nanocrystals exhibit a strong absorption in the near-infrared (NIR) region arising from the plasmon oscillations due to the presence of free electrons. The difference in the free electron concentration in bcc-ITO and rh-ITO nanocrystals is related to the different electronic structure of the donor states, associated with Sn 4+ dopants, in these two nanocrystal allotropic modifications. The donor activation energy is significantly higher in rh-ITO NCs, prohibiting any appreciable concentration of free electrons in the conduction band. The increased replacement of organic protective ligands by anions in the solution leads to the oriented attachment of larger sized bcc-ITO nanocrystals and the formation of flowerlike clusters. These results demonstrate tuning of the optical and electrical properties of complex oxide nanocrystals by selecting their crystal and electronic structures through size and composition and allow for a designed preparation and controlled self-assembly of ITO nanocrystals.

show abstract

X-ray photoelectron spectroscopy studies of indium tin oxide nanocrystalline powder

Cited by 60 publications

References 8 publications

Indium doped and carbon modified P25 nanocomposites with high visible-light sensitivity for the photocatalytic degradation of organic dyes

Indium doped and carbon modified P25 nanocomposites with high visible-light sensitivity for the photocatalytic degradation of organic dyes

Surface characterization of sol-gel derived indium tin oxide films on glass

Free Electron Concentration in Colloidal Indium Tin Oxide Nanocrystals Determined by Their Size and Structure

Contact Info

Product

Resources

About