High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressure

Journal Article · Mon Jan 15 00:00:00 EST 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.035426· OSTI ID:20976663

Menzel, A; Chang, K -C; Komanicky, V; Tolmachev, Y V; You, H ^[1]; Tkachuk, A V; Chu, Y S ^[2]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Experimental Facilities Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

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 [Vestergaard et al., Phys. Rev. Lett. 88, 259601 (2002)]. 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.

• OSTI ID: 20976663
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevB.75.035426; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ADSORPTION
ATMOSPHERIC PRESSURE
CARBON MONOXIDE
DENSITY
DIMERIZATION
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
HCP LATTICES
LAYERS
PHASE DIAGRAMS
PLATINUM
SCANNING TUNNELING MICROSCOPY
SUBSTRATES
SURFACES
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION