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Modification of the Size of Supported Clusters by Coadsorption of an Organic Compound: Gold and l-Cysteine on Rutile TiO(2)(110).

Ataman, Evren LU ; Isvoranu, Cristina LU ; Knudsen, Jan LU ; Schulte, Karina LU ; Andersen, Jesper N LU and Schnadt, Joachim LU (2011) In Langmuir 27(18). p.11466-11474
Abstract
Using X-ray photoelectron spectroscopy we studied the coadsorption of the amino acid l-cysteine and gold on a rutile TiO(2)(110) surface under ultrahigh vacuum conditions. Irrespective of the deposition order, i.e., irrespective of whether l-cysteine or gold is deposited first, the primary interaction between l-cysteine and the gold clusters formed at the surface takes place through the deprotonated thiol group of the molecule. The deposition order, however, has a profound influence on the size of the gold clusters as well as their location on the surface. If l-cysteine is deposited first the clusters are smaller by a factor two to three compared to gold deposited onto the pristine TiO(2)(110) surface and then covered by l-cysteine.... (More)
Using X-ray photoelectron spectroscopy we studied the coadsorption of the amino acid l-cysteine and gold on a rutile TiO(2)(110) surface under ultrahigh vacuum conditions. Irrespective of the deposition order, i.e., irrespective of whether l-cysteine or gold is deposited first, the primary interaction between l-cysteine and the gold clusters formed at the surface takes place through the deprotonated thiol group of the molecule. The deposition order, however, has a profound influence on the size of the gold clusters as well as their location on the surface. If l-cysteine is deposited first the clusters are smaller by a factor two to three compared to gold deposited onto the pristine TiO(2)(110) surface and then covered by l-cysteine. Further, in the former case the clusters cover the molecules and thus form the outermost layer of the sample. We also find that above a minimum gold cluster size the gold cluster/l-cysteine bond is stronger than the l-cysteine/surface bridging oxygen vacancy bond, which, in turn, is stronger than the gold cluster/vacancy bond. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
27
issue
18
pages
11466 - 11474
publisher
The American Chemical Society
external identifiers
  • wos:000294790500025
  • pmid:21806065
  • scopus:80052771790
ISSN
0743-7463
DOI
10.1021/la201923y
language
English
LU publication?
yes
id
7bdc71cd-d62c-4d33-8126-1d4c1d6c7446 (old id 2151628)
date added to LUP
2011-08-31 08:56:39
date last changed
2017-01-01 04:03:32
@article{7bdc71cd-d62c-4d33-8126-1d4c1d6c7446,
  abstract     = {Using X-ray photoelectron spectroscopy we studied the coadsorption of the amino acid l-cysteine and gold on a rutile TiO(2)(110) surface under ultrahigh vacuum conditions. Irrespective of the deposition order, i.e., irrespective of whether l-cysteine or gold is deposited first, the primary interaction between l-cysteine and the gold clusters formed at the surface takes place through the deprotonated thiol group of the molecule. The deposition order, however, has a profound influence on the size of the gold clusters as well as their location on the surface. If l-cysteine is deposited first the clusters are smaller by a factor two to three compared to gold deposited onto the pristine TiO(2)(110) surface and then covered by l-cysteine. Further, in the former case the clusters cover the molecules and thus form the outermost layer of the sample. We also find that above a minimum gold cluster size the gold cluster/l-cysteine bond is stronger than the l-cysteine/surface bridging oxygen vacancy bond, which, in turn, is stronger than the gold cluster/vacancy bond.},
  author       = {Ataman, Evren and Isvoranu, Cristina and Knudsen, Jan and Schulte, Karina and Andersen, Jesper N and Schnadt, Joachim},
  issn         = {0743-7463},
  language     = {eng},
  number       = {18},
  pages        = {11466--11474},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Modification of the Size of Supported Clusters by Coadsorption of an Organic Compound: Gold and l-Cysteine on Rutile TiO(2)(110).},
  url          = {http://dx.doi.org/10.1021/la201923y},
  volume       = {27},
  year         = {2011},
}