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Metal deposition onto thiol-covered gold: Platinum on a 4-mercaptopyridine SAM |
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| Authors: | M. Manolova, V. Ivanova, D.M. Kolb, H.-G. Boyen, P. Ziemann, M. Bü ttner, A. Romanyuk,P. Oelhafen |
| Affiliation: | aDepartment of Electrochemistry, University of Ulm, 89069 Ulm, Germany bDepartment of Solid State Physics, University of Ulm, 89069 Ulm, Germany cInstitute of Physics, University of Basel, 4056 Basel, Switzerland |
| Abstract: | In this study we describe details of a new technique that allows to deposit metal on top of a self-assembled monolayer (SAM). Monoatomic high platinum islands were formed on a 4-mercaptopyridine SAM on Au(1 1 1) by first immersing the SAM-covered gold electrode in an aqueous solution of K2PtCl4 without potential control to allow Pt(II) ions to form a complex with the pyridine nitrogen. The complexed Pt(II) ions were then reduced electrochemically to Pt(0) after transferring the electrode to a Pt(II) ion-free solution. Upon reduction, monoatomic high Pt islands were observed in STM, the total coverage depending on the time for complexation. Ex situ angle-resolved XPS studies reveal that the Pt islands indeed reside on top of the SAM. |
| Keywords: | Cyclic voltammetry Gold Mercaptopyridine Metal deposition Platinum Self-assembled monolayers STM XPS |
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