Study of sulfur adlayers on Au(1 1 1) from basic hydrolysis of piperazine bis(dithiocarbamate) sodium salt
Abstract
Sulfur adlayers on Au(1 1 1) 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(1 1 1) surface effectively reproduced the experimental STM images.
- Publication:
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Applied Surface Science
- Pub Date:
- August 2015
- DOI:
- 10.1016/j.apsusc.2015.03.163
- Bibcode:
- 2015ApSS..345..394M
- Keywords:
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- Sulfur adlayers;
- Dithiocarbamate;
- Scanning tunneling microscopy;
- X-ray photoelectron spectroscopy;
- Density functional theory