Growth of Co nanoparticles on a nanostructured {theta}-Al(sub 2)O(sub 3) film on CoAl(100).
We have investigated the growth of Co nanoparticles on {theta}-Al{sub 2}O{sub 3}/CoAl(1 0 0) by means of Auger electron spectroscopy (AES), high-resolution electron energy loss spectroscopy (EELS), low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Due to Volmer--Weber growth, Co forms particles with a mean diameter of approximately 2.5 nm and height of 0.8 nm. Even on the entirely covered oxide, there is no Ostwald ripening and Co particles stay structurally isolated. The nanoparticles exhibit a small size distribution and tend to form chains, as predetermined by the streak structure of the oxide template. For sufficient high coverages Co-core-CoO-shell nanoparticles may be evidenced, which is explained as a result of surfactant oxygen. The nanostructured particles may open the door to numerous applications, such as in catalysis and magnetoelectronic applications, where large areas of ordered nanodots are desired.
- 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:
- 914937
- Report Number(s):
- ANL/XSD/JA-58462; SUSCAS; TRN: US200817%%21
- Journal Information:
- Surf. Sci., Vol. 601, Issue 2007; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- ENGLISH
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