Surface modification of gold by quercetin monolayer for the electrochemical determination of copper(II)

Guang Ri Xu, Yong Yuan, Sunghyun Kim, Jae Joon Lee

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

A quercetin monolayer has been prepared on top of the self-assembled 3-mercaptopropionic acid (MPA) layer for the copper ion determination. Cu 2+ ions are readily accumulated on this modified electrode through the complex formation and electrochemically detected. With a quercetin layer, the redox process of Cu2+ became more reversible than at the MPA-modified electrode. Complexation sites in MPA and quercetin were occupied within five min when the electrode was immersed in 10 μM Cu2+ solution. The MPA and quercetin layers were stable enough to allow repeated EDTA treatment to remove adsorbed Cu2+ for the surface regeneration. Only 7% decrease was found after ten times regeneration and use. Linear current response was found over the concentration range of 1 nM and 10 μM with detection limit of 0.1 nM. Common interfering ions such as Cd2+, Zn2+, and Fe2+/3+ did not show any electrochemical response in the potential range of Cu2+ determination.

Original languageEnglish
Pages (from-to)1690-1695
Number of pages6
JournalElectroanalysis
Volume20
Issue number15
DOIs
StatePublished - Aug 2008

Keywords

  • Cu determination
  • Quercetin
  • Surface modification
  • Surface regeneration

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