Direct observations of metal support interaction in nano-scale systems

Robert F. Klie; Kai Sun; Mark M. Disko; J. Liu; N. D. Browning

doi:10.1117/12.450936

15 November 2002 Direct observation of metal support interaction in nano-scale systems

Robert F. Klie, Kai Sun, Mark M. Disko, J. Liu, N. D. Browning

Proceedings Volume 4807, Physical Chemistry of Interfaces and Nanomaterials; (2002) https://doi.org/10.1117/12.450936
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

In this paper, we will describe the experimental processes involved in analytical atomic-resolution scanning transmission electron microscopy (STEM) of supported nano-scale systems. We show that the combination of high-resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) provides an analytical tool with unprecedented chemical and spatial sensitivity that is vital for studying interfaces in heterogeneous catalyst systems. We apply the described methods to study two example heterogeneous catalyst systems: Pt/SiO₂, and Cu/Al₂O₃. In particular, the presence of a few monolayers of platinum oxide in Pt/SiO₂ can be clearly seen, and changes in the chemistry of the SiO₂ support within ~1 nm of the metal-oxide interface can be characterized as a function of the catalyst preparation conditions. The Cu/Al₂O₃, reduced at various temperatures, exhibits an increasing oxidation of the Cu-particles upon higher temperature reduction.

Citation Download Citation

Robert F. Klie, Kai Sun, Mark M. Disko, J. Liu, and N. D. Browning "Direct observation of metal support interaction in nano-scale systems", Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); https://doi.org/10.1117/12.450936

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