Journal
APPLIED SURFACE SCIENCE
Volume 507, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145069
Keywords
Magnetite; Iron oxide; Carbon monoxide; Scanning tunnelling microscopy; Temperature-programmed desorption; Model catalyst
Categories
Funding
- National Science Centre, Poland [2016/21/B/ST3/00861]
- statutory research funds of ICSC PAS within Ministry of Science and Higher Education, Poland
Ask authors/readers for more resources
We present studies on CO adsorption on an Fe3O4(1 1 1) surface with a regular tetrahedral termination (Fe-tet1) and with different hexagonal superstructures called `biphase' structures. All these terminations were precisely controlled on a 70 angstrom magnetite layer epitaxially grown on a Pt(1 1 1) single crystal. The experiments, including low energy electron diffraction, scanning tunnelling microscopy (STM) and temperature-programmed desorption (TPD), were carried out in situ under ultrahigh vacuum conditions. During the TPD measurements, the Fe3O4(1 1 1) surfaces were exposed to 0.1-20 L of CO at 105 K, and then the samples were heated with a linear temperature rise to 600 K. We found that as the Fe-tet1-terminated area decreases, as confirmed by STM observations, the surface becomes less active in CO adsorption. This means there are fewer adsorption states on the biphase structure than on Fe3O4(1 1 1) with regular termination.
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