Interaction of sulfur with bimetallic surfaces. Coadsorption of sulfur and noble metals on Ru(001)

Journal Article · Thu Nov 17 04:00:00 EST 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100097a035· OSTI ID:6605349

Kuhn, M; Rodriguez, J A ^[1]

---

1. Brookhaven National Lab., Upton, NY (United States)

The coadsorption of S with Cu or Ag on Ru(001) has been investigated using TDS, XPS, XAES, and CO chemisorption. At 300 K, copper and silver atoms in contact with Ru(001) react with S[sub 2] to form noble-metal sulfides. The Cu-S and Ag-S bonds in these surface compounds break at high temperatures (> 800 K) producing sulfur and noble-metal adatoms that compete for the ruthenium electrons. This competition leads to a weakening of 5-6 kcal/mol in the strength of the Ru-Cu and Ru-Ag bonds. A sulfur adatom produces long-range perturbations on the surface, diminishing the ability for bimetallic bonding of several (5-10) adjacent ruthenium atoms. At [theta][sub s] = 0.2 ML (ML = monolayer), all the ruthenium sites show a strong weakening in their bonding interactions with copper or silver adatoms. Photoemission experiments examining the interaction of S[sub 2] with copper and silver multilayers at 300 K show the formation of thick films of Cu[sub 2]S and Ag[sub 2]S at a fast rate. The decomposition pathways for these films are similar: evolution of S[sub 2] into gas phase, with the noble metal remaining solid. For Ag[sub 2]S films the decomposition process starts around 800 K, whereas Cu[sub 2]S films are stable up to 950 K. 55 refs., 13 figs.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6605349
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:46; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
COPPER
COPPER COMPOUNDS
COPPER SULFIDES
DECOMPOSITION
ELEMENTS
FILMS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
PYROLYSIS
RUTHENIUM
SILVER
SILVER COMPOUNDS
SILVER SULFIDES
SORPTION
SPECTROSCOPY
SULFIDES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS