Formation, Migration, and Reactivity of Au-CO Complexes on Gold Surfaces

Jun Wang, Monica McEntee, Wenjie Tang, Matthew Neurock, Arthur P. Baddorf, Petro Maksymovych, John T. Yates

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


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 106 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 (COδ+) on Au. Our 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.

Original languageEnglish (US)
Pages (from-to)1518-1526
Number of pages9
JournalJournal of the American Chemical Society
Issue number5
StatePublished - Feb 17 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.


Dive into the research topics of 'Formation, Migration, and Reactivity of Au-CO Complexes on Gold Surfaces'. Together they form a unique fingerprint.

Cite this