Journal of Applied Electrochemistry

, Volume 38, Issue 11, pp 1519–1526 | Cite as

Electrochemical gold deposition from sulfite solution: application for subsequent polyaniline layer formation

  • Gintaras Baltrūnas
  • Aušra Valiūnienė
  • Justas Vienožinskis
  • Ernestas Gaidamauskas
  • Teofilis Jankauskas
  • Žana Margarian
Original Paper

Abstract

Electrochemical gold deposition from sulfite solutions was studied by means of voltammetry, EIS and EQCM. A gold film electrode was used for polyaniline layer formation by electrochemical oxidation of aniline. The standard electrochemical reduction potential of the reaction [Au(SO3)2]3− + e = Au + 2 SO32− was determined, and is equal to 0.116 V (vs. NHE). Both solution stirring and temperature increase accelerate the electrochemical reduction of gold, when the electrode potential is below −0.55 V. When the potential is above −0.55 V the electrochemical reduction proceeds via passive layer formation. Our study suggests that the passive layer consists of chemically adsorbed sulfite ions and sulfur. The gold film deposited from sulfite solution is a high quality substrate suitable for conducting polymer layer formation. This technique, where a polymer layer electrode is prepared by thin gold film deposition onto a metal surface and by subsequent polymer layer formation, can be applied in sensor research and technology.

Keywords

Adsorption Electrochemical impedance spectroscopy Gold Passive layer Sulfite Sulfur Microbalance 

Notes

Acknowledgments

The authors thank the Lithuanian State Science and Studies Foundation (grant No. B-34/2008) for partial financial support.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Gintaras Baltrūnas
    • 1
  • Aušra Valiūnienė
    • 1
  • Justas Vienožinskis
    • 1
  • Ernestas Gaidamauskas
    • 1
  • Teofilis Jankauskas
    • 1
  • Žana Margarian
    • 1
  1. 1.Faculty of ChemistryVilnius UniversityVilniusLithuania

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