High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure.
We report structure studies of high-density CO monolayers on Pt(111) surfaces in equilibrium with gaseous CO near atmospheric pressure, using surface x-ray scattering (SXS) and scanning tunneling microscopy (STM). We were able to stabilize extremely well-ordered CO monolayers by emersion transfer from an electrochemical cell. We found the hexagonal close-packed (2x2)-3CO structure at room temperature in {approx}1 atm CO gas pressure. We also confirm the ({radical}(19)x{radical}(19))-13CO structure previously proposed in STM studies. Based on SXS and STM measurements, a tentative phase diagram is proposed. Detailed SXS structure studies of the (2x2)-3CO structure suggest a surface structure and substrate reconstruction less symmetric than previously studies suggested. We also find that ({radical}(19)x{radical}(19))-13CO structure induces substrate reconstructions including the dimerization of Pt bonded to bridging CO and the rotation of the Pt cluster with atop CO.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 914918
- Report Number(s):
- ANL/MSD/JA-58379
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2007 Vol. 75; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- ENGLISH
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