Strategy for the syntheses of isolated fine silver nanoparticles and polypyrrole/silver nanocomposites on gold substrates

Yu Chuan Liu, Hsun Tsing Lee, Shung Jim Yang

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In this work, isolated fine silver nanoparticles and polypyrrole/silver nanocomposites with diameters of about 10 nm on gold substrates were first prepared by electrochemical methods. First, an Ag substrate was cycled in a deoxygenated aqueous solution containing 0.1 M HCl from -0.30 to +0.30 V versus Ag/AgCl at 5 mV/s with 30 scans. Subsequently the Ag working electrode was immediately replaced by an Au electrode and a cathodic overpotential of 0.2 V was applied under controlled sonication to synthesize Ag nanoparticles on the Au electrode. Then pyrrole monomers were encouragingly found to be polymerized on the deposited Ag nanoparticles. This polymerization is distinguishable from the known chemical or electrochemical one, due to the electrochemical activity of unreduced species of Agn + clusters inside the nanoparticles. Also, this polymerization may be ascribed to the oxidizing agent of AuCl4 -, which is present on the Au electrode.

Original languageEnglish
Pages (from-to)3441-3445
Number of pages5
JournalElectrochimica Acta
Volume51
Issue number17
DOIs
Publication statusPublished - Apr 25 2006
Externally publishedYes

Keywords

  • Electrochemical methods
  • Oxidation-reduction cycle
  • Polymerization
  • Polypyrrole
  • Silver nanoparticles

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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