Surface chemistry of monolayer metallic films on Re(0001) and Mo(110)
- Department of Chemistry, Texas A M University, College Station, TX (USA)
The overlayer growth of Fe, Ni, and Cu on a Mo(110) surface and Fe and Cu on Re(0001) as well as adsorption of D{sub 2} and CO on the prepared bimetallic surfaces have been studied in the sample temperature ({ital T}{sub {ital s}} ) range 115--1500 K, using Auger electron spectroscopy (AES), low-energy electron diffraction (LEED), and thermal desorption spectroscopy (TDS). Fe, Ni, and Cu on Mo(110) and Fe and Cu on Re(0001) were found to grow layer by layer upon deposition at {ital T}{sub {ital s}} =115 K whereas multilayer deposits, upon annealing to {ital T}{sub {ital s}} {gt}330 K, nucleate into three-dimensional (3D) clusters. The 3D clusters of Fe and Cu are shown by LEED to be epitaxial with respect to the Mo(110) and Re(0001) substrates. Fe at submonolayer coverages is believed to form a strained pseudomorphic superlattice on Mo(110) while similar coverages of Ni on Mo(110) and of Cu on Re(0001) form a superstructure. The results of chemisorption of D{sub 2} and CO on the prepared bimetallic surfaces Fe/Mo(110), Ni/Mo(110), and Cu/Re(0001) are presented and discussed. It is shown that these ultrathin metal films exhibit chemisorptive properties quite different from those of the bulk metal.
- OSTI ID:
- 6789010
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ADSORPTION
ANNEALING
AUGER ELECTRON SPECTROSCOPY
CHEMICAL REACTIONS
CHEMISORPTION
COATINGS
COHERENT SCATTERING
COPPER
DEPOSITION
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HEAT TREATMENTS
IRON
METALS
MOLYBDENUM
NICKEL
NUCLEATION
RHENIUM
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SUPERLATTICES
SURFACE COATING
TRANSITION ELEMENTS