Temperature dependence of the morphology and electronic structure of ultrathin platinum on TiO2-teminated SrTiO3 (001)
Abstract
The authors investigate properties of ultrathin Pt as a function of coverage (up to 10 monolayers) on TiO2-terminated SrTiO3 (001) substrate at different temperatures (200–800 °C). In situ x-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy are used to observe the electronic structure and surface morphology evolution of Pt. The authors find that although Pt will not wet SrTiO3 in the thermodynamic sense, it forms a continuous film when deposited at 200 °C due to the low surface mobility. At 800 °C, even at very low coverage, Pt forms nanoclusters showing bulk-like metallic features in the photoemission spectra. The authors compare the observed electronic structure evolution of Pt and the different growth patterns at low and high temperatures with available theoretical calculations.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 05, 2017
- Source ID
- 10.1116/1.4991892
Entities
People
- Agham Posadas
- Alexander A Demkov
- Wei Guo
Organizations
- Air Force Office of Scientific Research
- University of Texas at Austin