Thermal stability of Co-core-CoO-shell nanoparticles on an ultrathin {Theta} Al(sub 2)O(sub 3) film support.
- Center for Nanoscale Materials
The effect of annealing temperature on a system of Co-core-CoO-shell nanoparticles on {Theta}-Al{sub 2}O{sub 3}/CoAl(100) has been investigated using a combination of Auger electron spectroscopy, high-resolution electron energy loss spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy. Results show that thermal treatment leads to a decomposition of the CoO-shell above 450 K, and thus it is strongly diminished with respect to the bulk value. Between 550 and 1050 K the Co particles coalescence and diffuse through the oxide into the substrate. Due to defect recovery, the thermal stability of the thin aluminum oxide film remained unchanged compared to as-grown {theta}-Al{sub 2}O{sub 3}.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1010883
- Report Number(s):
- ANL/XSD/JA-63742
- Journal Information:
- J. Appl. Phys., Journal Name: J. Appl. Phys. Journal Issue: Apr. 2007 Vol. 101; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- ENGLISH
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