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Journal Article

Oxidation-resistant gold-55 clusters


Spatz,  Joachim P.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;
Biophysical Chemistry, Institute of Physical Chemistry, University of Heidelberg, 69120 Heidelberg, Germany;

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Boyen, H. G., Kastle, G., Weigl, F., Koslowski, B., Dietrich, C., Ziemann, P., et al. (2002). Oxidation-resistant gold-55 clusters. Science, 297(5586), 1533-1536. doi:Oxidation-resistant gold-55 clusters.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-C933-A
Gold nanoparticles ranging in diameter from 1 to 8 nanometers were prepared on top of silicon wafers in order to study the size dependence of their oxidation behavior when exposed to atomic oxygen. X-ray photoelectron spectroscopy showed a maximum oxidation resistance for "magic-number" clusters containing 55 gold atoms. This inertness is not related to electron confinement leading to a size-induced metal-to-insulator transition, but rather seems to be linked to the closed-shell structure of such magic clusters. The result additionally suggests that gold-55 clusters may act as especially effective oxidation catalysts, such as for oxidizing carbon monoxide.