Basic electrochemical properties of sputtered gold film electrodes

Milan Libansky, Jiri Zima, Jiri Barek, Alena Reznickova, Vaclav Svorcik, Hana Dejmkova

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Gold nanolayers made by sputtering of pure gold (physical vapour deposition) are commonly used for many biophysical and material applications. However, the use of sputtering method for fabrication of working electrodes for electroanalytical purposes is less common. This paper focuses on the testing and characterization of sputtered working roughened gold nanostructured film electrodes, which fall into category of upcoming desirable new generation of nanostructured gold working electrodes. Gold nanostructured films (80 nm thin) were sputtered onto 50 μm thin PTFE substrates with three different types of treatment: pristine, plasma treated, and plasma treated and subsequently spontaneously grafted with biphenyl-4,4′-dithiol. The characterization of gold nanostructured film electrodes was carried out by examination of the electrode reaction of standard redox probes (ferrocyanide/ferricyanide, hydroquinone/benzoquinone) in different types of supporting electrolytes (BR buffers of various pH, KCl, KNO3, H2SO4), by exploration of the electrode surface by scanning electron microscopy, by atomic force microscopy accompanied by elementary analysis and contact angle measurements. The testing of electrodes was complemented by an attempt to calculate their real surface areas from Randles-Sevcik equation. All results were compared to conventional bulk gold electrode. The practical applicability of the nanostructured gold electrodes as sensors for the determination of environmental pollutants was verified by voltammetric determination of hydroquinone as a model electrochemically oxidisable organic environmental pollutant.

Original languageEnglish
Pages (from-to)452-460
Number of pages9
JournalElectrochimica Acta
Volume251
DOIs
Publication statusPublished - 10 Oct 2017
Externally publishedYes

Keywords

  • Gold film electrodes
  • Gold sputtering
  • Grafting
  • Nanostructured electrodes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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