Microstructure of Precipitated Au Nanoclusters in TiO{sub 2}
Gold nanoclusters dispersed in single crystal TiO{sub 2} (110) have been formed by 2MeV Au{sup 2+} implantation to an ion fluence of 6.0 x 10{sup 16} cm{sup -2} at 300 K and 975 K followed by annealing at 1275 K for 10 hours. The morphological features, size and crystallographic orientation of the Au nanoclusters with respect to the TiO{sub 2} matrix have been investigated using conventional transmission electron microscopy and electron diffractions. In particular, the interface structure between the Au nanoclusters and TiO{sub 2} was investigated. Atomic structural model of interface between Au and TiO{sub 2} was established based on high-resolution transmission electron microscopy (HRTEM) imaging and HRTEM image simulations. Two types of orientation relationship can be identified, Au<110>//TiO{sub 2} [001] and Au{l_brace}111{r_brace}//TiO{sub 2} (200), and Au<110>//TiO{sub 2} [001] and Au{l_brace}111{r_brace}//TiO{sub 2} (110). Au clusters are faceted along Au{l_brace}112{r_brace}and Au{l_brace}111{r_brace} or Au{l_brace}220{r_brace} and Au{l_brace}002{r_brace} planes. The precipitated Au clusters show extensive (111) twins. These orientation relationships are the same for Au clusters grown on TiO{sub 2} (110) surface, indicating that lowering interfacial energy to be a governing factor for setting the orientation relationship.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15009996
- Report Number(s):
- PNNL-SA-40120; TRN: US200433%%414
- Resource Relation:
- Conference: Continuous Nanophase and Nanostructured Materials. Materials Research Society Symposium Proceedings, Boston, MA (US), 12/2003; Other Information: PBD: 30 Jun 2004
- Country of Publication:
- United States
- Language:
- English
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