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.
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Tesche, B., Alizo Delgado, E. & Knözinger, H. High-resolution transmission electron microscopy of Os-clusters supported on model alumina-films. Catal Lett 10, 171–180 (1991). https://doi.org/10.1007/BF00772069
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DOI: https://doi.org/10.1007/BF00772069