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Related Experiment Videos

The composition and structure of Pd-Au surfaces.

C-W Yi1, K Luo, T Wei

  • 1Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

Palladium-gold surface alloys form stable structures on molybdenum substrates. Annealing controls alloy composition, creating isolated palladium sites surrounded by gold for tunable surface properties.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Understanding the surface properties of bimetallic alloys is crucial for catalysis and materials design.
  • Palladium-gold (Pd-Au) alloys are of interest due to their unique electronic and catalytic properties.
  • Controlling the surface composition and structure of alloys is key to tailoring their performance.

Purpose of the Study:

  • To investigate the formation and surface characteristics of Pd-Au alloys on a Mo(110) substrate.
  • To determine how annealing temperature and bulk composition influence surface alloy formation.
  • To characterize the atomic arrangement and composition of Pd-Au surface alloys.

Main Methods:

  • Physical vapor deposition (PVD) for alloy preparation.

Related Experiment Videos

  • Low-energy ion scattering spectroscopy (LEISS) for surface elemental composition.
  • Infrared absorption spectroscopy (IRAS) for surface species identification.
  • Temperature-programmed desorption (TPD) for surface binding energies.
  • X-ray photoelectron spectroscopy (XPS) for surface and bulk composition analysis.

    • Main Results:

    • Pd-Au mixtures form stable surface alloys on Mo(110) between 700 and 1000 K.
    • Surface alloys exhibit significant gold enrichment compared to bulk composition.
    • Annealing a 1:1 Pd-Au mixture at 800 K results in a surface alloy of Au(0.8)Pd(0.2).
    • Palladium atoms in the surface alloy are predominantly surrounded by gold atoms, forming isolated Pd sites.
    • Surface Pd concentration can be systematically tuned by adjusting the bulk alloy composition.

    Conclusions:

    • Stable Pd-Au surface alloys with tunable compositions can be fabricated on Mo(110).
    • The observed surface segregation and alloy formation are temperature-dependent.
    • The formation of isolated Pd sites surrounded by Au offers potential for selective catalytic applications.