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Journal Article

High-resolution transmission electron microscopy of Os-clusters supported on model alumina-films

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Tesche,  Bernd
Fritz Haber Institute, Max Planck Society;

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Citation

Tesche, B., Delgado, E. A., & Knözinger, H. (1991). High-resolution transmission electron microscopy of Os-clusters supported on model alumina-films. Catalysis Letters, 10, 171-180. doi:10.1007/BF00772069.


Cite as: https://hdl.handle.net/21.11116/0000-0009-6BFE-2
Abstract
Thin planar model alumina films can be successfully used as supports for metal species in the size range⩽ 1 nm, provided the electron optical conditions (defocus setting) are optimized. Os3(CO)12-clusters were anchored on the model support intact and the triatomic clusters (∼ 0.6 nm diameter) could be made visible. Metal aggregation in H2-atmospheres and redispersion in CO and O2 atmospheres has been studied. It is suggested that CO-induced fragmentation of small osmium particles exposing low-coordinated surface atoms probably leads to mononuclear surface carbonyl complexes.