CO adsorption on Cu3Pt(111): a LEIS study

Y. G. Shen; D. J. O'Connor; K. Wandelt; R. J. MacDonald

doi:10.1016/0039-6028(95)00149-2

CO adsorption on Cu₃Pt(111): a LEIS study

Y. G. Shen^*, D. J. O'Connor, K. Wandelt, R. J. MacDonald

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

23 Citations (Scopus)

Abstract

The interaction of CO with the Cu₃Pt(111) surface has been studied by low energy He⁺ ion scattering. The intensities of He⁺ ions scattered off O, Cu and Pt were only detected, indicating the orientation of the CO molecule with O facing away from the surface. In the initial stages of CO adsorption at 200 K, the Pt intensity in a Cu-enriched surface was not detectable at an exposure of 6 L CO. This was interpreted as a preferential chemisorption of CO onto Pt sites. At a saturation coverage of CO, however, the Pt intensity in a Pt-enriched surface fell to ∼ 15% of its clean surface intensity, indicating not all the Pt sites were covered by the CO molecules. The results also suggested that the presence of the CO adsorbed surface layer does not induce surface segregation of Pt. The distance between the adsorbed CO along the [01̄1] azimuth below a saturation of CO coverage has also been tested. © 1995.

Original language	English
Pages (from-to)	746-752
Journal	Surface Science
Volume	331-333
Issue number	PART A
DOIs	https://doi.org/10.1016/0039-6028(95)00149-2
Publication status	Published - 1 Jul 1995
Externally published	Yes

Research Keywords

Alloys
Carbon monoxide
Chemisorption
Copper
Low energy ion scattering (LEIS)
Low index single crystal surfaces
Platinum
Surface segregation

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@article{323e32a283ee46d98f17dd3e5dd322be,

title = "CO adsorption on Cu3Pt(111): a LEIS study",

abstract = "The interaction of CO with the Cu3Pt(111) surface has been studied by low energy He+ ion scattering. The intensities of He+ ions scattered off O, Cu and Pt were only detected, indicating the orientation of the CO molecule with O facing away from the surface. In the initial stages of CO adsorption at 200 K, the Pt intensity in a Cu-enriched surface was not detectable at an exposure of 6 L CO. This was interpreted as a preferential chemisorption of CO onto Pt sites. At a saturation coverage of CO, however, the Pt intensity in a Pt-enriched surface fell to ∼ 15% of its clean surface intensity, indicating not all the Pt sites were covered by the CO molecules. The results also suggested that the presence of the CO adsorbed surface layer does not induce surface segregation of Pt. The distance between the adsorbed CO along the [0{\=1}1] azimuth below a saturation of CO coverage has also been tested. {\textcopyright} 1995.",

keywords = "Alloys, Carbon monoxide, Chemisorption, Copper, Low energy ion scattering (LEIS), Low index single crystal surfaces, Platinum, Surface segregation",

author = "Shen, {Y. G.} and O'Connor, {D. J.} and K. Wandelt and MacDonald, {R. J.}",

year = "1995",

month = jul,

day = "1",

doi = "10.1016/0039-6028(95)00149-2",

language = "English",

volume = "331-333",

pages = "746--752",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "PART A",

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TY - JOUR

T1 - CO adsorption on Cu3Pt(111)

T2 - a LEIS study

AU - Shen, Y. G.

AU - O'Connor, D. J.

AU - Wandelt, K.

AU - MacDonald, R. J.

PY - 1995/7/1

Y1 - 1995/7/1

N2 - The interaction of CO with the Cu3Pt(111) surface has been studied by low energy He+ ion scattering. The intensities of He+ ions scattered off O, Cu and Pt were only detected, indicating the orientation of the CO molecule with O facing away from the surface. In the initial stages of CO adsorption at 200 K, the Pt intensity in a Cu-enriched surface was not detectable at an exposure of 6 L CO. This was interpreted as a preferential chemisorption of CO onto Pt sites. At a saturation coverage of CO, however, the Pt intensity in a Pt-enriched surface fell to ∼ 15% of its clean surface intensity, indicating not all the Pt sites were covered by the CO molecules. The results also suggested that the presence of the CO adsorbed surface layer does not induce surface segregation of Pt. The distance between the adsorbed CO along the [01̄1] azimuth below a saturation of CO coverage has also been tested. © 1995.

AB - The interaction of CO with the Cu3Pt(111) surface has been studied by low energy He+ ion scattering. The intensities of He+ ions scattered off O, Cu and Pt were only detected, indicating the orientation of the CO molecule with O facing away from the surface. In the initial stages of CO adsorption at 200 K, the Pt intensity in a Cu-enriched surface was not detectable at an exposure of 6 L CO. This was interpreted as a preferential chemisorption of CO onto Pt sites. At a saturation coverage of CO, however, the Pt intensity in a Pt-enriched surface fell to ∼ 15% of its clean surface intensity, indicating not all the Pt sites were covered by the CO molecules. The results also suggested that the presence of the CO adsorbed surface layer does not induce surface segregation of Pt. The distance between the adsorbed CO along the [01̄1] azimuth below a saturation of CO coverage has also been tested. © 1995.

KW - Alloys

KW - Carbon monoxide

KW - Chemisorption

KW - Copper

KW - Low energy ion scattering (LEIS)

KW - Low index single crystal surfaces

KW - Platinum

KW - Surface segregation

UR - http://www.scopus.com/inward/record.url?scp=0029344608&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0029344608&origin=recordpage

U2 - 10.1016/0039-6028(95)00149-2

DO - 10.1016/0039-6028(95)00149-2

M3 - RGC 21 - Publication in refereed journal

SN - 0039-6028

VL - 331-333

SP - 746

EP - 752

JO - Surface Science

JF - Surface Science

IS - PART A

ER -