Electroactivity of Cu2+ at a thin film assembly of gold nanoparticles linked by 11-mercaptoundecanoic acid

Lisa B. Israel, Nancy N. Kariuki, Li Han, Mathew M. Maye, Jin Luo, Chuan Jian Zhong

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Core-shell nanoparticles are emerging advanced materials for developing novel electroanalytical platforms. This paper describes the results of an investigation of the electroactivity of Cu2+ ions on electrodes coated with thin films assembled from thiolate-encapsulated gold nanoparticles of 2 nm core size (Au2-nm) and a carboxylic functionalized alkyl thiol linker, i.e. 11-mercaptoundecanoic acid (MUA). The high surface-to-volume ratio and the 3-D ligand network properties are potentially useful as sensitive and selective nanomaterials for the monitoring and removal of environmental heavy metals. The nanostructured MUA-Au2-nm film is sensitive to Cu2+ below 1 ppm. The selectivity of the electroactivity is also probed using mixed-metal systems such as Cu2+ and Fe3+ and Cu2+ and Zn2+. Issues related to the electrochemical activity of these metal ions are also discussed.

Original languageEnglish (US)
Pages (from-to)69-76
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume517
Issue number1-2
DOIs
StatePublished - Dec 28 2001
Externally publishedYes

Keywords

  • Carboxylic acid
  • Copper ion
  • Electrochemistry
  • Gold nanoparticles
  • Heavy metal
  • Nanostructured thin film assembly

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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