Electrodeposition of Au monolayer on Pt(111) mediated by self-assembled monolayers

Journal of the American Chemical Society
Yaw-Chia YangYuh-Lang Lee

Abstract

In-situ scanning tunneling microscopy (STM), cyclic voltammetry (CV), and infrared reflection-adsorption spectroscopy (IRRAS) have been used to examine the electrodeposition of gold onto Pt(111) electrodes modified with benzenethiol (BT) and benzene-1,2-dithiol (BDT) in 0.1 M HClO4 containing 10 microM HAuCl4. Both BT and BDT were attached to Pt(111) via one sulfur headgroup. STM and IRRAS results indicated that the other SH group of BDT was pendant in the electrolyte. Both BT and BDT formed (2 x 2) structures at the coverage of 0.25, and they were transformed into (square root(3) x square root(3))R30 degrees as the coverage was raised to 0.33. These two organic surface modifiers resulted in 3D and 2D gold islands at BT- and BDT-coated Pt(111) electrodes, respectively. The pendant SH group of BDT could interact specifically with gold adspecies to immobilize gold adatoms on the Pt(111) substrate, which yields a 2D growth of gold deposition. Molecular resolution STM revealed an ordered array of (6 x 2 square root(13)) after a full monolayer of gold was plated on the BDT/Pt(111) electrode. Since BDT was strongly adsorbed on Pt(111), gold adatoms only occupied free sites between BDT admolecules on Pt(111). This is supported by a st...Continue Reading

References

Jun 1, 1992·Physical Review Letters· van der Vegt HAJ M Thornton
Apr 2, 1999·Science·K SieradzkiN Dimitrov

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Citations

Apr 26, 2017·Nature Communications·Hui WangNobuyuki Imanishi
May 8, 2009·Physical Chemistry Chemical Physics : PCCP·Fakhradin MirkhalafDavid J Schiffrin
Aug 4, 2011·Physical Chemistry Chemical Physics : PCCP·Yuriy YansonMarcel J Rost
Oct 1, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Jing-Jiang YuJayne C Garno

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