Nanoscale surface chemistry

Proceedings of the National Academy of Sciences of the United States of America
Theodore E MadeyJohn E Rowe

Abstract

We report evidence in several experiments for nanometer-size effects in surface chemistry. The evidence concerns bimetallic systems, monolayer films of Pt or Pd on W(111) surfaces. Pyramidal facets with [211] faces are formed on annealing on physical monolayer of Pt, Pd on a W(111) substrate, and facet sizes increase with annealing temperature. We used synchrotron radiation-based soft x-ray photoemission to show that monolayer films of Pt, Pd, on W "float" on the outer surface, whereas multilayer films form alloys on annealing. Acetylene reactions over bimetallic planar and faceted Pd/W surfaces exhibit size effects on the nanometer scale, that is, thermal desorption spectra of reactively formed benzene and ethylene (after acetylene adsorption) change systematically with facet size. In the second case, the decomposition of C(2)H(2) over planar and faceted Ir(210) surfaces also exhibits structure sensitivity; temperature programmed desorption of H(2) from C(2)H(2) dissociation depends on the nanoscale surface structure. Finally, we have characterized interactions of Cu with the highly ordered S(4 x 4)/W(111) surface. The substrate is a sulfur-induced nanoscale reconstruction of W(111) with (4 x 4) periodicity, having broad plana...Continue Reading

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Citations

Sep 27, 2008·Chemical Society Reviews·Theodore E MadeyTimo Jacob
Apr 7, 2005·Journal of the American Chemical Society·Wenhua ChenTheodore E Madey
Jan 1, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Wenhua ChenTimo Jacob
Oct 20, 2011·Journal of the American Chemical Society·Zongxia GuoSteven De Feyter
Apr 8, 2006·The Journal of Physical Chemistry. B·You HanQingfeng Ge
Jul 21, 2006·The Journal of Physical Chemistry. B·M José-YacamanE Sacher

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