Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces
Abstract
Here, we report experimental as well as theoretical evidence that suggests Au CO complex formation upon the exposure of CO to active sites (step edges and threading dislocations) on a Au(111) surface. Room-temperature scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, transmission infrared spectroscopy, and density functional theory calculations point to Au CO complex formation and migration. Room-temperature STM of the Au(111) surface at CO pressures in the range from 10^ 8 to 10^ 4 Torr (dosage up to 10^6 langmuir) indicates Au atom extraction from dislocation sites of the herringbone reconstruction, mobile Au CO complex formation and diffusion, and Au adatom cluster formation on both elbows and step edges on the Au surface. The formation and mobility of the Au CO complex result from the reduced Au Au bonding at elbows and step edges leading to stronger Au CO bonding and to the formation of a more positively charged CO (CO +) on Au. These studies indicate that the mobile Au CO complex is involved in the Au nanoparticle formation and reactivity, and that the positive charge on CO increases due to the stronger adsorption of CO at Au sites with lower coordination numbers.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1238006
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 138; Journal Issue: 5; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Wang, Jun, McEntee, Monica, Tang, Wenjie, Neurock, Matthew, Baddorf, Arthur P., Maksymovych, Petro, and Yates, Jr, John T. Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces. United States: N. p., 2016.
Web. doi:10.1021/jacs.5b09052.
Wang, Jun, McEntee, Monica, Tang, Wenjie, Neurock, Matthew, Baddorf, Arthur P., Maksymovych, Petro, & Yates, Jr, John T. Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces. United States. https://doi.org/10.1021/jacs.5b09052
Wang, Jun, McEntee, Monica, Tang, Wenjie, Neurock, Matthew, Baddorf, Arthur P., Maksymovych, Petro, and Yates, Jr, John T. Tue .
"Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces". United States. https://doi.org/10.1021/jacs.5b09052. https://www.osti.gov/servlets/purl/1238006.
@article{osti_1238006,
title = {Formation, Migration, and Reactivity of Au CO Complexes on Gold Surfaces},
author = {Wang, Jun and McEntee, Monica and Tang, Wenjie and Neurock, Matthew and Baddorf, Arthur P. and Maksymovych, Petro and Yates, Jr, John T.},
abstractNote = {Here, we report experimental as well as theoretical evidence that suggests Au CO complex formation upon the exposure of CO to active sites (step edges and threading dislocations) on a Au(111) surface. Room-temperature scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, transmission infrared spectroscopy, and density functional theory calculations point to Au CO complex formation and migration. Room-temperature STM of the Au(111) surface at CO pressures in the range from 10^ 8 to 10^ 4 Torr (dosage up to 10^6 langmuir) indicates Au atom extraction from dislocation sites of the herringbone reconstruction, mobile Au CO complex formation and diffusion, and Au adatom cluster formation on both elbows and step edges on the Au surface. The formation and mobility of the Au CO complex result from the reduced Au Au bonding at elbows and step edges leading to stronger Au CO bonding and to the formation of a more positively charged CO (CO +) on Au. These studies indicate that the mobile Au CO complex is involved in the Au nanoparticle formation and reactivity, and that the positive charge on CO increases due to the stronger adsorption of CO at Au sites with lower coordination numbers.},
doi = {10.1021/jacs.5b09052},
journal = {Journal of the American Chemical Society},
number = 5,
volume = 138,
place = {United States},
year = {Tue Jan 12 00:00:00 EST 2016},
month = {Tue Jan 12 00:00:00 EST 2016}
}
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