Chemical Imaging of Terrace-Based Active Sites on Gold

Kevin S. Schneider; Kenneth T. Nicholson; Bradford G. Orr; Mark M. Banaszak Holl

doi:10.1021/la0363027

Chemical Imaging of Terrace-Based Active Sites on Gold

Kevin S. Schneider, Kenneth T. Nicholson, Bradford G. Orr, Mark M. Banaszak Holl

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9 Citations (Scopus)

Abstract

Scanning tunneling microscopy data of a mixed monolayer comprised of a 40:60 ratio of H ₈Si ₁₈O ₁₂ and C ₆H ₁₃-H ₇Si ₈O ₁₂ clusters on gold are presented. The images display a composite monolayer surface with well-defined domain regions of the individual components. Holes present at face-centered cubic (fcc) sites of the starting Au/H ₇Si ₈O ₁₂ adsorbate layer indicate the location of active sites for impinging C ₆H ₁₃-H ₇Si ₈O ₁₂ clusters. Adsorption of a C ₆H ₁₃-H ₇Si ₈O ₁₂ cluster likely yields a mobile hydrogen atom available to recombine with and desorb an adjacent H ₈Si ₈O ₁₂ cluster. Hydrogen atom diffusion along substrate directions is the proposed pattern formation mechanism of the mixed monolayer. Imaging of the spherosiloxane cluster domains identifies a novel terrace-based active site located in the fcc regions of the Au(111) 23 × √3 surface reconstruction.

Original language	English
Pages (from-to)	2250-2256
Number of pages	7
Journal	Langmuir
Volume	20
Issue number	6
DOIs	https://doi.org/10.1021/la0363027
Publication status	Published - 16 Mar 2004
Externally published	Yes

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title = "Chemical Imaging of Terrace-Based Active Sites on Gold",

abstract = "Scanning tunneling microscopy data of a mixed monolayer comprised of a 40:60 ratio of H 8Si 18O 12 and C 6H 13-H 7Si 8O 12 clusters on gold are presented. The images display a composite monolayer surface with well-defined domain regions of the individual components. Holes present at face-centered cubic (fcc) sites of the starting Au/H 7Si 8O 12 adsorbate layer indicate the location of active sites for impinging C 6H 13-H 7Si 8O 12 clusters. Adsorption of a C 6H 13-H 7Si 8O 12 cluster likely yields a mobile hydrogen atom available to recombine with and desorb an adjacent H 8Si 8O 12 cluster. Hydrogen atom diffusion along substrate directions is the proposed pattern formation mechanism of the mixed monolayer. Imaging of the spherosiloxane cluster domains identifies a novel terrace-based active site located in the fcc regions of the Au(111) 23 × √3 surface reconstruction.",

author = "Schneider, {Kevin S.} and Nicholson, {Kenneth T.} and Orr, {Bradford G.} and {Banaszak Holl}, {Mark M.}",

year = "2004",

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doi = "10.1021/la0363027",

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T1 - Chemical Imaging of Terrace-Based Active Sites on Gold

AU - Schneider, Kevin S.

AU - Nicholson, Kenneth T.

AU - Orr, Bradford G.

AU - Banaszak Holl, Mark M.

PY - 2004/3/16

Y1 - 2004/3/16

N2 - Scanning tunneling microscopy data of a mixed monolayer comprised of a 40:60 ratio of H 8Si 18O 12 and C 6H 13-H 7Si 8O 12 clusters on gold are presented. The images display a composite monolayer surface with well-defined domain regions of the individual components. Holes present at face-centered cubic (fcc) sites of the starting Au/H 7Si 8O 12 adsorbate layer indicate the location of active sites for impinging C 6H 13-H 7Si 8O 12 clusters. Adsorption of a C 6H 13-H 7Si 8O 12 cluster likely yields a mobile hydrogen atom available to recombine with and desorb an adjacent H 8Si 8O 12 cluster. Hydrogen atom diffusion along substrate directions is the proposed pattern formation mechanism of the mixed monolayer. Imaging of the spherosiloxane cluster domains identifies a novel terrace-based active site located in the fcc regions of the Au(111) 23 × √3 surface reconstruction.

AB - Scanning tunneling microscopy data of a mixed monolayer comprised of a 40:60 ratio of H 8Si 18O 12 and C 6H 13-H 7Si 8O 12 clusters on gold are presented. The images display a composite monolayer surface with well-defined domain regions of the individual components. Holes present at face-centered cubic (fcc) sites of the starting Au/H 7Si 8O 12 adsorbate layer indicate the location of active sites for impinging C 6H 13-H 7Si 8O 12 clusters. Adsorption of a C 6H 13-H 7Si 8O 12 cluster likely yields a mobile hydrogen atom available to recombine with and desorb an adjacent H 8Si 8O 12 cluster. Hydrogen atom diffusion along substrate directions is the proposed pattern formation mechanism of the mixed monolayer. Imaging of the spherosiloxane cluster domains identifies a novel terrace-based active site located in the fcc regions of the Au(111) 23 × √3 surface reconstruction.

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Chemical Imaging of Terrace-Based Active Sites on Gold

Abstract

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