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Title: Atomic Level Imaging of Au Nanocluster Dispersed in TiO 2 and SrTiO 3

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Pacific Northwest National Laboratory (PNNL)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
978106
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms; Journal Volume: 242
Country of Publication:
United States
Language:
English

Citation Formats

Wang, C. M., Shutthanandan, V., Zhang, Y., Thevuthasan, S., Thomas, L. E., Weber, William J., and Duscher, Gerd J M. Atomic Level Imaging of Au Nanocluster Dispersed in TiO2 and SrTiO3. United States: N. p., 2006. Web. doi:10.1016/j.nimb.2005.08.144.
Wang, C. M., Shutthanandan, V., Zhang, Y., Thevuthasan, S., Thomas, L. E., Weber, William J., & Duscher, Gerd J M. Atomic Level Imaging of Au Nanocluster Dispersed in TiO2 and SrTiO3. United States. doi:10.1016/j.nimb.2005.08.144.
Wang, C. M., Shutthanandan, V., Zhang, Y., Thevuthasan, S., Thomas, L. E., Weber, William J., and Duscher, Gerd J M. Sun . "Atomic Level Imaging of Au Nanocluster Dispersed in TiO2 and SrTiO3". United States. doi:10.1016/j.nimb.2005.08.144.
@article{osti_978106,
title = {Atomic Level Imaging of Au Nanocluster Dispersed in TiO2 and SrTiO3},
author = {Wang, C. M. and Shutthanandan, V. and Zhang, Y. and Thevuthasan, S. and Thomas, L. E. and Weber, William J. and Duscher, Gerd J M},
abstractNote = {},
doi = {10.1016/j.nimb.2005.08.144},
journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},
number = ,
volume = 242,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}
  • Gold nanoclusters dispersed in single crystal TiO{sub 2}, MgO, and SrTiO{sub 3} have been prepared by ion implantation at 300-975 K and subsequent annealing at 1275 K for 10 h. High-resolution transmission electron microscopy and high-angle annular dark field (HAADF) imaging in aberration corrected scanning transmission electron microscope (STEM) have been used to characterize the microstructure of the gold nanoclusters dispersed materials. STEM-HAADF imaging with atomic resolution has directly revealed for all three materials that Au atoms partially occupy cation lattice positions. Cavities up to several tens of nanometers were observed in MgO and SrTiO{sub 3}. The cavities and goldmore » clusters are spatially associated in MgO and SrTiO{sub 3}, indicating a strong interaction between the Au cluster and cavities. For MgO and SrTiO{sub 3}, the faceting planes appear to be the same for both nanometer-sized cavity and the Au cluster, demonstrating that both the surface energy and the interfacial energy between Au cluster and the matrix are lowest on these planes.« less
  • Gold nanoclusters dispersed in single crystal TiO?, MgO, and SrTiO? have been prepared by ion implantation at 300 K - 975 K and subsequent annealing at 1275 K for 10 hours. High resolution transmission electron microscopy and high-angle-annular-dark-field (HAADF) imaging in aberration corrected scanning transmission electron microscope (STEM) have been used to characterize the microstructure of the gold nanoclusters dispersed materials. STEM-HAADF imaging with atomic resolution has directly revealed for all three materials that Au atoms occupy cations lattice positions. Cavities of up to several tens nanometers were observed in the TiO? and SrTiO?. The cavities and gold clusters appearmore » to be spatially associated in SrTiO?. The nanometer-sized cavities and the Au cluster are faceted along the same lattice plane of the matrix, indicating that the interfacial energy defined by the Au cluster and the matrix follows the same order of the surface energy for different lattice plane.« less
  • Au nanoclusters dispersed in single crystal TiO2 and SrTiO3 have been prepared by ion implantation at 300 and 975 K and subsequent annealing at 1275 K for 10 hours. High resolution transmission electron microscopy and high-angle-annular-dark-field (HAADF) imaging in an aberration corrected scanning transmission electron microscope (STEM) have been used to characterize the microstructure of the dispersed gold nanoclusters. The results indicate that Au atoms substitute for cations in these systems. Cavities of up to several tens of nanometers are observed in TiO2 and SrTiO3. The nanometer-sized cavities and Au clusters are faceted along the same lattice plane of themore » matrix, indicating that the interfacial energy (defined by the Au cluster and the matrix) and the surface energy of the matrix (defined by cavity and the matrix ) follow a similar trend of change with respect to different lattice planes of the matrix.« less
  • An atomic-scale analysis of the interfacial structure and defects in CaTi 5O 11grown on SrTiO 3and TiO 2-B grown on CaTi 5O 11is presented.
  • We investigated infrared-active phonons of CaTiO3, SrTiO3, BaTiO3, and Ba0.5Sr0.5TiO3 thin films, and a (BaTiO3)5/(SrTiO3)5 artificial superlattice by a Fourier transform infrared spectrometer with a grazing angle (48{sup o}) incident reflectance method. The longitudinal phonon energies of the thin films were different from those of the bulk material due to the lattice strain of the substrate. The Ba0.5Sr0.5TiO3 thin film and (BaTiO3)5/(SrTiO3)5 superlattice showed different phonon modes due to structural discrepancies, even though their chemical compositions are similar. The Ba0.5Sr0.5TiO3 thin film showed a single phonon energy lying between the phonon energies of BaTiO3 and SrTiO3 thin films, while themore » (BaTiO3)5/(SrTiO3)5 superlattice well preserved the characteristic phonon modes of BaTiO3 and SrTiO3 thin films.« less