Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system

TE Jones, TCQ Noakes, P Bailey, Christopher John Baddeley

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The adsorption Of the catalytically important chiral modifier, (R,R)-tartaric acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Au films on Ni{111}. Reflection adsorption infrared spectroscopy measurements revealed that the adsorption mode of (R,R)-tartaric acid depends very strongly on the surface composition. Deprotonation to produce ail adsorbed bitartrate species was achieved only when small Ni clusters became available in the bimetallic surface. Medium-energy ion-scattering studies showed that, once the bitartrate species was able to be produced, significant adsorbate-induced Ni segregation was observed. Scanning tunneling microscopy (STM) investigations suggest that segregation is particularly facile in the proximity of step edges. In addition, STM revealed that the ordered (9 x 9) structure previously reported by Jacobsen et al.(1) is stable even with relatively high concentrations of Ni in the surface layer.

Original languageEnglish
Pages (from-to)4759
Number of pages4759
JournalJournal of Physical Chemistry B
Volume108
DOIs
Publication statusPublished - 15 Apr 2004

Keywords

  • ENERGY ION-SCATTERING
  • BIMETALLIC SURFACES
  • CHIRAL SURFACES
  • NI(110)
  • ALLOYS
  • AU
  • NANOPARTICLES
  • INTERFACES
  • ADSORPTION
  • CATALYSTS

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