Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system

TE Jones; TCQ Noakes; P Bailey; Christopher John Baddeley

doi:10.1021/jp0364607

Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system

TE Jones, TCQ Noakes, P Bailey, Christopher John Baddeley

Research output: Contribution to journal › Article › peer-review

Abstract

The adsorption Of the catalytically important chiral modifier, (R,R)-tartaric acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Au films on Ni{111}. Reflection adsorption infrared spectroscopy measurements revealed that the adsorption mode of (R,R)-tartaric acid depends very strongly on the surface composition. Deprotonation to produce ail adsorbed bitartrate species was achieved only when small Ni clusters became available in the bimetallic surface. Medium-energy ion-scattering studies showed that, once the bitartrate species was able to be produced, significant adsorbate-induced Ni segregation was observed. Scanning tunneling microscopy (STM) investigations suggest that segregation is particularly facile in the proximity of step edges. In addition, STM revealed that the ordered (9 x 9) structure previously reported by Jacobsen et al.(1) is stable even with relatively high concentrations of Ni in the surface layer.

Original language	English
Pages (from-to)	4759
Number of pages	4759
Journal	Journal of Physical Chemistry B
Volume	108
DOIs	https://doi.org/10.1021/jp0364607
Publication status	Published - 15 Apr 2004

Keywords

ENERGY ION-SCATTERING
BIMETALLIC SURFACES
CHIRAL SURFACES
NI(110)
ALLOYS
AU
NANOPARTICLES
INTERFACES
ADSORPTION
CATALYSTS

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10.1021/jp0364607

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title = "Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system",

abstract = "The adsorption Of the catalytically important chiral modifier, (R,R)-tartaric acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Au films on Ni{111}. Reflection adsorption infrared spectroscopy measurements revealed that the adsorption mode of (R,R)-tartaric acid depends very strongly on the surface composition. Deprotonation to produce ail adsorbed bitartrate species was achieved only when small Ni clusters became available in the bimetallic surface. Medium-energy ion-scattering studies showed that, once the bitartrate species was able to be produced, significant adsorbate-induced Ni segregation was observed. Scanning tunneling microscopy (STM) investigations suggest that segregation is particularly facile in the proximity of step edges. In addition, STM revealed that the ordered (9 x 9) structure previously reported by Jacobsen et al.(1) is stable even with relatively high concentrations of Ni in the surface layer.",

keywords = "ENERGY ION-SCATTERING, BIMETALLIC SURFACES, CHIRAL SURFACES, NI(110), ALLOYS, AU, NANOPARTICLES, INTERFACES, ADSORPTION, CATALYSTS",

author = "TE Jones and TCQ Noakes and P Bailey and Baddeley, {Christopher John}",

year = "2004",

month = apr,

day = "15",

doi = "10.1021/jp0364607",

language = "English",

volume = "108",

pages = "4759",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society (ACS)",

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TY - JOUR

T1 - Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system

AU - Jones, TE

AU - Noakes, TCQ

AU - Bailey, P

AU - Baddeley, Christopher John

PY - 2004/4/15

Y1 - 2004/4/15

N2 - The adsorption Of the catalytically important chiral modifier, (R,R)-tartaric acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Au films on Ni{111}. Reflection adsorption infrared spectroscopy measurements revealed that the adsorption mode of (R,R)-tartaric acid depends very strongly on the surface composition. Deprotonation to produce ail adsorbed bitartrate species was achieved only when small Ni clusters became available in the bimetallic surface. Medium-energy ion-scattering studies showed that, once the bitartrate species was able to be produced, significant adsorbate-induced Ni segregation was observed. Scanning tunneling microscopy (STM) investigations suggest that segregation is particularly facile in the proximity of step edges. In addition, STM revealed that the ordered (9 x 9) structure previously reported by Jacobsen et al.(1) is stable even with relatively high concentrations of Ni in the surface layer.

AB - The adsorption Of the catalytically important chiral modifier, (R,R)-tartaric acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Au films on Ni{111}. Reflection adsorption infrared spectroscopy measurements revealed that the adsorption mode of (R,R)-tartaric acid depends very strongly on the surface composition. Deprotonation to produce ail adsorbed bitartrate species was achieved only when small Ni clusters became available in the bimetallic surface. Medium-energy ion-scattering studies showed that, once the bitartrate species was able to be produced, significant adsorbate-induced Ni segregation was observed. Scanning tunneling microscopy (STM) investigations suggest that segregation is particularly facile in the proximity of step edges. In addition, STM revealed that the ordered (9 x 9) structure previously reported by Jacobsen et al.(1) is stable even with relatively high concentrations of Ni in the surface layer.

KW - ENERGY ION-SCATTERING

KW - BIMETALLIC SURFACES

KW - CHIRAL SURFACES

KW - NI(110)

KW - ALLOYS

KW - AU

KW - NANOPARTICLES

KW - INTERFACES

KW - ADSORPTION

KW - CATALYSTS

UR - http://www.scopus.com/inward/record.url?scp=2342519353&partnerID=8YFLogxK

UR - http://pubs.acs.org/cgi-bin/article.cgi/jpcbfk/2004/108/i15/pdf/jp0364607.pdf

U2 - 10.1021/jp0364607

DO - 10.1021/jp0364607

M3 - Article

SN - 1520-6106

VL - 108

SP - 4759

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

ER -

Adsorbate induced segregation in the Ni{111}/Au/(R,R)-tartaric acid system

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Keywords

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