Thiol Adsorption on the Au(100)-hex and Au(100)-(1 × 1) Surfaces
- Grumelli, Doris Elda
- Cristina, Lucila Josefina
- Lobo Maza, Flavia Emilia
- Carro, Pilar
- Ferron, Julio
- Kern, Klaus
- Salvarezza, Roberto Carlos
DOIAbstract
Alkanethiol adsorption on the Au(100) surfaces is studied by using scanning tunneling microscopy, X-ray photoelectron spectroscopy, and electrochemical techniques. Adsorption of hexanethiol (HT) on the Au(100)-hex surface results in the formation of elongated Au islands following the typical stripes of the reconstruction. Ordered molecular arrays forming hexagonally distorted square patterns cover the stripes with surface coverage ≈0.33. On the other hand, HT adsorption on the Au(100)-(1 × 1) surface shows the absence of the elongated island and the formation of square molecular patterns with a surface coverage ≈0.44. The core level shift of thiolates adsorbed on the Au(100)-(1 × 1) and Au(111) is only 0.15 eV, suggesting that chemistry rat...
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