Martínèz, J. A., Valenzuela, J., Hernandez Tamargo, C. E., Cao-Milán, R., Herrera, J., Díaz, J. A., Farías, M. H., Mikosch, H., & Hernández, M. (2015). Study of sulfur adlayers on Au(111) from basic hydrolysis of piperazine bis(dithiocarbamate) sodium salt. Applied Surface Science, 345, 394–399. https://doi.org/10.1016/j.apsusc.2015.03.163
E164-04-2 - Forschungsgruppe Elektrochemische Methoden und Korrosion
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Journal:
Applied Surface Science
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ISSN:
0169-4332
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Date (published):
2015
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Number of Pages:
6
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Publisher:
Elsevier
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; X-ray photoelectron spectroscopy; General Physics and Astronomy; General Chemistry; Surfaces, Coatings and Films; Surfaces and Interfaces; Scanning tunneling microscopy; Density functional theory; Sulfur adlayers; Dithiocarbamate
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Abstract:
Sulfur adlayers on Au(111) were obtained after the interaction of a gold substrate with an alkaline solution of piperazine bis(dithiocarbamate) sodium salt. Characterization of the sulfur modified gold surface was performed by means of X-Ray Photoelectron Spectroscopy (XPS), Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT) calculations. XPS signals indicated the presence of S-Au bonds, monomeric and polymeric sulfur, and absence of nitrogen and sodium. Images from STM showed the formation of quasi-rectangular octomers in coexistence with another phase. A DFT model using the arrangement of sulfur dimers on the Au(111) surface effectively reproduced the experimental STM images.
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Research Areas:
Materials Characterization: 10% Surfaces and Interfaces: 90%