In-situ surface analysis of AuPd(110) under elevated pressure of CO
Résumé
With the combination of various in-situ surface science tools, surface
chemical and structural properties of bimetallic AuPd(1 1 0) alloys are
characterized under elevated CO pressure. Under 1 Torr of CO gas
pressure, STM images show the formation of nano-sized surface
rice-grains along the index direction of [1-10] while PM-IRRAS shows new
CO vibrational band. This new vibrational band of PM-IRRAS is confirmed
as the CO molecules attached to atop site of Pd with the results of
ambient pressure XPS. In the case of adsorption of CO on AuPd(1 1 0)
alloys, the so-called "pressure gap" exists and the surface morphology
and its chemical states change at elevated pressure conditions. (C) 2015
Elsevier B.V. All rights reserved.