Electrochemical detection of Cd2+ ions by a self-assembled monolayer of 1,9-nonanedithiol on gold

Esteban Malel, Jatin K. Sinha, Izabella Zawisza, Gunther Wittstock, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


The application of 1,9-nonanedithiol (NDT) self-assembled monolayer (SAM) on gold for the electrochemical determination of Cd2+ was studied. Interestingly, we found that a NDT SAM strongly affects the stripping wave of Cd, resulting in a sharp peak that was used for electroanalytical determination of Cd2+ in aqueous solutions. The different parameters, such as potential and time of deposition of Cd, were examined. Furthermore, polarization-modulated infrared reflection absorption spectroscopy (PM IRRAS) and X-ray photoelectron spectroscopy (XPS) were used for exploring the interaction between the deposited Cd and the thiol groups on Au. FTIR measurements clearly indicate that NDT is assembled in a disordered liquid type monolayer interacting with the Au electrode via both thiol moieties. XPS reveals that Cd is stripped at two different potentials and that the signal of sulfur is almost unchanged by deposition and desorption of Cd. All these finding allude to the interesting conclusion that Cd is deposited on Au lifting to some extent the thiol groups.

Original languageAmerican English
Pages (from-to)6753-6758
Number of pages6
JournalElectrochimica Acta
Issue number23
StatePublished - 1 Oct 2008

Bibliographical note

Funding Information:
This work was supported by the Lower Saxony-Israeli Foundation (Niedersächsisch-Israelische Stiftung, ZN1744).


  • Cd determination
  • Cyclic voltammetry
  • Infrared reflection absorption spectroscopy
  • Preconcentration
  • Self-assembled monolayer
  • X-ray photoelectron spectroscopy


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