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Direct observation of local chemical surface properties by scanning tunneling microscopy

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Direct observation of local chemical surface properties by scanning tunneling microscopy. / Hoster, Harry E.

In: AIP Conference Proceedings, Vol. 1454, No. 9, 2012, p. 9-14.

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Hoster HE. Direct observation of local chemical surface properties by scanning tunneling microscopy. AIP Conference Proceedings. 2012;1454(9):9-14. doi: 10.1063/1.4730676

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Hoster, Harry E. / Direct observation of local chemical surface properties by scanning tunneling microscopy. In: AIP Conference Proceedings. 2012 ; Vol. 1454, No. 9. pp. 9-14.

Bibtex

@article{f3ef54946aa9439291c244f581734426,
title = "Direct observation of local chemical surface properties by scanning tunneling microscopy",
abstract = "Vapor deposited Pt films with a thickness locally varying between one and two atomic layers on Ru(0001) are studied as model surfaces with a well-defined lateral variation of the chemical properties. These are probed by reversible CO adsorption at 300 K and with CO pressures in the range p(CO)=10(-10) ... 10(-5) mbar under real-time STM observation. Upon exposure to 10-5 mbar CO, no densely packed adlayer is formed on the areas with a local thickness of one atomic layer, whereas a c(4x2) adlayer containing 0.5 CO molecules per surface atom is reversibly formed on areas with locally two atomic layers of Pt. Based on experimental and theoretical data points and parameters from the literature we calculate adsorption isotherms for Pt(111) and the two Ru(0001) supported Pt thin films at 300 K. For all three surfaces, STM observations on CO adsorption are found to be fully consistent with the respective isotherms.",
keywords = "Bimetallic Surfaces, Adsorption, Scanning Tunneling Microscopy, CARBON-MONOXIDE, CO ADSORPTION, PT-RU, HETEROGENEOUS CATALYSIS, METAL-SURFACES, PT(111), ALLOYS, ELECTROOXIDATION, REACTIVITY, OXIDATION",
author = "Hoster, {Harry E.}",
year = "2012",
doi = "10.1063/1.4730676",
language = "English",
volume = "1454",
pages = "9--14",
journal = "AIP Conference Proceedings",
issn = "0094-243X",
publisher = "American Institute of Physics Publising LLC",
number = "9",
note = "International Conference on Physics and Its Applications (ICPAP) ; Conference date: 10-11-2011 Through 11-11-2011",

}

RIS

TY - JOUR

T1 - Direct observation of local chemical surface properties by scanning tunneling microscopy

AU - Hoster, Harry E.

PY - 2012

Y1 - 2012

N2 - Vapor deposited Pt films with a thickness locally varying between one and two atomic layers on Ru(0001) are studied as model surfaces with a well-defined lateral variation of the chemical properties. These are probed by reversible CO adsorption at 300 K and with CO pressures in the range p(CO)=10(-10) ... 10(-5) mbar under real-time STM observation. Upon exposure to 10-5 mbar CO, no densely packed adlayer is formed on the areas with a local thickness of one atomic layer, whereas a c(4x2) adlayer containing 0.5 CO molecules per surface atom is reversibly formed on areas with locally two atomic layers of Pt. Based on experimental and theoretical data points and parameters from the literature we calculate adsorption isotherms for Pt(111) and the two Ru(0001) supported Pt thin films at 300 K. For all three surfaces, STM observations on CO adsorption are found to be fully consistent with the respective isotherms.

AB - Vapor deposited Pt films with a thickness locally varying between one and two atomic layers on Ru(0001) are studied as model surfaces with a well-defined lateral variation of the chemical properties. These are probed by reversible CO adsorption at 300 K and with CO pressures in the range p(CO)=10(-10) ... 10(-5) mbar under real-time STM observation. Upon exposure to 10-5 mbar CO, no densely packed adlayer is formed on the areas with a local thickness of one atomic layer, whereas a c(4x2) adlayer containing 0.5 CO molecules per surface atom is reversibly formed on areas with locally two atomic layers of Pt. Based on experimental and theoretical data points and parameters from the literature we calculate adsorption isotherms for Pt(111) and the two Ru(0001) supported Pt thin films at 300 K. For all three surfaces, STM observations on CO adsorption are found to be fully consistent with the respective isotherms.

KW - Bimetallic Surfaces

KW - Adsorption

KW - Scanning Tunneling Microscopy

KW - CARBON-MONOXIDE

KW - CO ADSORPTION

KW - PT-RU

KW - HETEROGENEOUS CATALYSIS

KW - METAL-SURFACES

KW - PT(111)

KW - ALLOYS

KW - ELECTROOXIDATION

KW - REACTIVITY

KW - OXIDATION

U2 - 10.1063/1.4730676

DO - 10.1063/1.4730676

M3 - Journal article

VL - 1454

SP - 9

EP - 14

JO - AIP Conference Proceedings

JF - AIP Conference Proceedings

SN - 0094-243X

IS - 9

T2 - International Conference on Physics and Its Applications (ICPAP)

Y2 - 10 November 2011 through 11 November 2011

ER -