Distinguishlbility of oxygen desorption from the surface region with mobility dominant effects in nanocrystalline ceria films

Laxmikant Saraf, V. Shutthanandan, Y. Zhang, S. Thevuthasan, C. M. Wang, Anter El-Azab, Donald R. Baer

Research output: Contribution to journalArticle

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Abstract

We present an investigation of oxygen ( 18O) uptake measurements in 1 μm thick nanocrystalline ceria films grown on single crystal Al 2O 3(0001) by nuclear reaction analysis (NRA). Oxygen uptake measurements were carried out in the temperature range of 200-600°C at a background 18O pressure of 4.0 × 10 -6 Torr. Average grain size in the as-grown films, synthesized by sol-gel process was ∼3 nm confirmed by high-resolution transmission electron microscopy and x-ray diffraction measurements. From the diffusion depth profiles, changes in intensity and slopes in surface and interface regions indicate complex oxygen mobility effects. Oxygen desorption is clearly distinguishable in the film surface region as a result of shift in the oxygen concentration maxima. It is argued that high defect density in nanocrystalline ceria which is associated with nanograin surface combined with intermediate temperature reducing environment triggers multiple processes such as molecular and ionic diffusion, adsorption, desorption, and isotope exchange interactions. The promising nature of NRA is realized as an effective tool to acquire the depth-dependent information from complex reactions existing in nanocrystalline environment.

Original languageEnglish
Pages (from-to)5756-5760
Number of pages5
JournalJournal of Applied Physics
Volume96
Issue number10
DOIs
Publication statusPublished - 15 Nov 2004
Externally publishedYes

Fingerprint

desorption
oxygen
nuclear reactions
ionic diffusion
molecular diffusion
sol-gel processes
x ray diffraction
isotopes
actuators
grain size
slopes
transmission electron microscopy
adsorption
temperature
shift
high resolution
single crystals
defects
profiles
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Saraf, L., Shutthanandan, V., Zhang, Y., Thevuthasan, S., Wang, C. M., El-Azab, A., & Baer, D. R. (2004). Distinguishlbility of oxygen desorption from the surface region with mobility dominant effects in nanocrystalline ceria films. Journal of Applied Physics, 96(10), 5756-5760. https://doi.org/10.1063/1.1803605

Distinguishlbility of oxygen desorption from the surface region with mobility dominant effects in nanocrystalline ceria films. / Saraf, Laxmikant; Shutthanandan, V.; Zhang, Y.; Thevuthasan, S.; Wang, C. M.; El-Azab, Anter; Baer, Donald R.

In: Journal of Applied Physics, Vol. 96, No. 10, 15.11.2004, p. 5756-5760.

Research output: Contribution to journalArticle

Saraf, L, Shutthanandan, V, Zhang, Y, Thevuthasan, S, Wang, CM, El-Azab, A & Baer, DR 2004, 'Distinguishlbility of oxygen desorption from the surface region with mobility dominant effects in nanocrystalline ceria films', Journal of Applied Physics, vol. 96, no. 10, pp. 5756-5760. https://doi.org/10.1063/1.1803605
Saraf, Laxmikant ; Shutthanandan, V. ; Zhang, Y. ; Thevuthasan, S. ; Wang, C. M. ; El-Azab, Anter ; Baer, Donald R. / Distinguishlbility of oxygen desorption from the surface region with mobility dominant effects in nanocrystalline ceria films. In: Journal of Applied Physics. 2004 ; Vol. 96, No. 10. pp. 5756-5760.
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