The (100) surface of a AuPd bulk alloy was imaged by scanning tunneling microscopy. Chemical-contrast revealed structures with short-range order involving surface Pd atoms at c(2x2) sites with respect to the surface lattice—a first time observation of a known active heterogeneous catalytic site with atomic resolution. Comparison of the Pd distribution in a AuPd(100) surface with that in a Au3Pd(100) surface shows the unique thermodynamic properties of the 50 : 50 alloy are decisive in controlling the formation of isolated Pd sites.
Revised: January 10, 2008 |
Published: November 21, 2007
Citation
Han P., S. Axnanda, I. Lyubinetsky, and D.W. Goodman. 2007.Atomic-Scale Assembly of a Heterogeneous Catalytic Site.Journal of the American Chemical Society 129, no. 46:14355-14361.PNNL-SA-54742.doi:10.1021/ja074891n