Journal
SURFACE SCIENCE
Volume 572, Issue 1, Pages 103-114Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2004.08.033
Keywords
iron oxide; platinum; carbon monoxide; water; thermal desorption; infrared absorption spectroscopy; electron energy loss spectroscopy (EELS); chemisorption; single crystal surfaces; surface structure, morphology, roughness, and topography
Categories
Ask authors/readers for more resources
We have studied adsorption of CO on Fe3O4(111) films grown on a Pt(111) substrate by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) and high resolution electron energy loss spectroscopy (HREELS). Three adsorption states are observed, from which CO desorbs at similar to110, 180, and 230 K. CO adsorbed in these states exhibits stretching frequencies at similar to2115-2140, 2080 and 2207cm(-1), respectively. The adsorption results are discussed in terms of different structural models previously reported. We suggest that the Fe3O4(111) surface is terminated by 1/2 ML of iron, with an outermost 1/4 ML consisting of octahedral Fe2+ cations situated above an 1/4 ML of tetrahedral Fe3+ ions, in agreement with previous theoretical calculations. The most strongly bound CO is assigned to adsorption to Fe3+ cations present on the step edges. (C) 2004 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available