Campus Units

Chemistry, Materials Science and Engineering, Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

11-18-2019

Journal or Book Title

Physical Chemistry Chemical Physics

DOI

10.1039/C9CP03449H

Abstract

Experimental data from low-temperature Scanning Tunneling Microscopy (LTSTM) studies on coinage metal surfaces with very low coverages of S is providing new insights into metal-S interactions. A previous LTSTM study for Cu(100), and a new analysis reported here for Ag(100), both indicate no metal-sulfur complex formation, but an Au4S5 complex was observed previously on Au(100). In marked contrast, various complexes have been proposed and/or observed on Ag(111) and Cu(111), but not on Au(111). Also, exposure to trace amounts of S appears to enhance mass transport far more dramatically on (111) than on (100) surfaces for Cu and Ag, a feature tied to the propensity for complex formation. Motivated by these observations, we present a comprehensive assessment at the level of DFT to assess the existence and stability of complexes on (100) surfaces, and compare results with previous analyses for (111) surfaces. Consistent with experiment, our DFT analysis finds no stable complexes on Ag(100) and Cu(100), but several exist for Au(100). In addition, we systematically relate stability for adsorbed and gas-phase species within the framework of Hess`s law. We thereby provide key insight into the various energetic contributions to stability which in turn elucidates the difference in behavior between (100) and (111) surfaces.

Comments

This is a manuscript of an article published as Liu, Da-Jiang, Peter Michael Spurgeon, Jiyoung Lee, Theresa L. Windus, Patricia Ann Thiel, and James W. Evans. "Sulfur adsorption on coinage metal (100) surfaces: Propensity for metal-sulfur complex formation relative to (111) surfaces." Physical Chemistry Chemical Physics (2019). DOI: 10.1039/C9CP03449H. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial 3.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 License

Copyright Owner

The Royal Society of Chemistry

Language

en

File Format

application/pdf

Published Version

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