Atomic imaging of oxide-supported metallic nanocrystals.
- Materials Science Division
The nucleation of noble metal nanoparticles on oxide surfaces can lead to dramatic enhancements in catalytic activity that are related to the atomic-scale formation of the nanoparticles and interfaces. For the case of submonolayer Pt deposited on the 2 x 1 SrTiO{sub 3}(001) surface atomic-force microscopy shows the formation of nanoparticles. We use X-ray standing wave (XSW) atomic imaging to show that these nanoparticles are composed of Pt face-centered-cubic nanocrystals with cube-on-cube epitaxy laterally correlated to the substrate unit cell. The phase sensitivity of the XSW allows for a direct measurement of the interface offset between the two unit cells along the c-axis. Different Pt coverages lead to differences in the observed XSW image of the interfacial structure, which is explained by a proposed model based on the Pt-Pt interaction becoming stronger than the Pt-substrate interaction as the global coverage is increased from 0.2 to 0.6 ML.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1035773
- Report Number(s):
- ANL/MSD/JA-72386; TRN: US201205%%386
- Journal Information:
- ACS Nano, Vol. 5, Issue 12; ISSN 1936-0851
- Country of Publication:
- United States
- Language:
- ENGLISH
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