Self-assembling of nanocavities in TiO2 dispersed with Au nanoclusters

C. M. Wang, Y. Zhang, V. Shutthanandan, D. R. Baer, W. J. Weber, L. E. Thomas, S. Thevuthasan, G. Duscher

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

There has been considerable research effort on tailoring the nonlinear optical properties of dielectric materials by dispersing nanometer-sized metallic clusters in them. It has been proposed that the optical response of this type of material is related to the quantum antidots (vacancy clusters), which is spatially located at the interface between the metal cluster and the dielectric matrix. In order to clarify the vacancy clustering behavior as well as its correlation with Au clustering, single crystal TiO2 has been implanted with Au ions at 975K and subsequently annealed at 1275K for 10h. A characteristic self-assembling of nanocavities along the boundary between the region of Au clusters and the free surface has been observed in the present system. These cavities are faceted along TiO2(110) and have a size of ∼10nm. High angle annular dark-field (HAADF) imaging in an aberration corrected scanning transmission electron microscope (STEM) revealed that vacancy clusters of ∼2nm in size also exist in the Au populated regions. Formation of cavities in Au-irradiated TiO2 strongly indicates that vacancy clustering processes prevail over Frenkel-pair recombination. Furthermore, the Au atoms substitution for Ti in TiO2 is also directly observed by STEM-HAADF imaging and by channeling Rutherford backscattering spectrometry.

Original languageEnglish
Article number245421
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number24
DOIs
Publication statusPublished - 15 Dec 2005
Externally publishedYes

Fingerprint

Nanoclusters
assembling
nanoclusters
Vacancies
Electron microscopes
electron microscopes
Scanning
Imaging techniques
cavities
scanning
dispersing
Rutherford backscattering spectroscopy
metal clusters
Aberrations
Spectrometry
aberration
backscattering
Substitution reactions
Optical properties
Metals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Wang, C. M., Zhang, Y., Shutthanandan, V., Baer, D. R., Weber, W. J., Thomas, L. E., ... Duscher, G. (2005). Self-assembling of nanocavities in TiO2 dispersed with Au nanoclusters. Physical Review B - Condensed Matter and Materials Physics, 72(24), [245421]. https://doi.org/10.1103/PhysRevB.72.245421

Self-assembling of nanocavities in TiO2 dispersed with Au nanoclusters. / Wang, C. M.; Zhang, Y.; Shutthanandan, V.; Baer, D. R.; Weber, W. J.; Thomas, L. E.; Thevuthasan, S.; Duscher, G.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 72, No. 24, 245421, 15.12.2005.

Research output: Contribution to journalArticle

Wang, CM, Zhang, Y, Shutthanandan, V, Baer, DR, Weber, WJ, Thomas, LE, Thevuthasan, S & Duscher, G 2005, 'Self-assembling of nanocavities in TiO2 dispersed with Au nanoclusters', Physical Review B - Condensed Matter and Materials Physics, vol. 72, no. 24, 245421. https://doi.org/10.1103/PhysRevB.72.245421
Wang, C. M. ; Zhang, Y. ; Shutthanandan, V. ; Baer, D. R. ; Weber, W. J. ; Thomas, L. E. ; Thevuthasan, S. ; Duscher, G. / Self-assembling of nanocavities in TiO2 dispersed with Au nanoclusters. In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 72, No. 24.
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