Characteristics of polypyrrole electrodeposited onto roughened substrates composed of gold-silver bimetallic nanoparticles

Hsun Tsing Lee, Yu Chuan Liu, Li Huei Lin

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In this work, the characteristics of polypyrrole (PPy) films electrodeposited onto an electrochemically roughened gold substrate with bimetallic silver and gold nanoparticles were first investigated. First, a silver substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 M HCl. Subsequently, a gold substrate was roughened by a similar ORC treatment in this used solution. The results revealed that the surface of the roughened gold substrate demonstrated two different kinds of deposition domains because of the modification of silver nanoparticles. Encouragingly, some novel characteristics of PPy deposited onto this substrate were observed, in comparison with those on the roughened gold substrate without the modification of silver nanoparticles. They included a denser and more compact surface morphology, higher oxidation degree, increased conductivity, and improved surface-enhanced Raman scattering. Furthermore, the nucleation and growth mechanism for PPy electropolymerization on this silver-modified roughened gold substrate was distinguishable from that on the unmodified one.

Original languageEnglish
Pages (from-to)2724-2731
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume44
Issue number8
DOIs
Publication statusPublished - Apr 15 2006
Externally publishedYes

Fingerprint

Polypyrroles
Silver
Gold
Nanoparticles
Substrates
Electropolymerization
polypyrrole
Surface morphology
Raman scattering
Nucleation
Oxidation

Keywords

  • Electrochemistry
  • Polypyrroles
  • Raman spectroscopy

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Characteristics of polypyrrole electrodeposited onto roughened substrates composed of gold-silver bimetallic nanoparticles. / Lee, Hsun Tsing; Liu, Yu Chuan; Lin, Li Huei.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 44, No. 8, 15.04.2006, p. 2724-2731.

Research output: Contribution to journalArticle

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N2 - In this work, the characteristics of polypyrrole (PPy) films electrodeposited onto an electrochemically roughened gold substrate with bimetallic silver and gold nanoparticles were first investigated. First, a silver substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 M HCl. Subsequently, a gold substrate was roughened by a similar ORC treatment in this used solution. The results revealed that the surface of the roughened gold substrate demonstrated two different kinds of deposition domains because of the modification of silver nanoparticles. Encouragingly, some novel characteristics of PPy deposited onto this substrate were observed, in comparison with those on the roughened gold substrate without the modification of silver nanoparticles. They included a denser and more compact surface morphology, higher oxidation degree, increased conductivity, and improved surface-enhanced Raman scattering. Furthermore, the nucleation and growth mechanism for PPy electropolymerization on this silver-modified roughened gold substrate was distinguishable from that on the unmodified one.

AB - In this work, the characteristics of polypyrrole (PPy) films electrodeposited onto an electrochemically roughened gold substrate with bimetallic silver and gold nanoparticles were first investigated. First, a silver substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 M HCl. Subsequently, a gold substrate was roughened by a similar ORC treatment in this used solution. The results revealed that the surface of the roughened gold substrate demonstrated two different kinds of deposition domains because of the modification of silver nanoparticles. Encouragingly, some novel characteristics of PPy deposited onto this substrate were observed, in comparison with those on the roughened gold substrate without the modification of silver nanoparticles. They included a denser and more compact surface morphology, higher oxidation degree, increased conductivity, and improved surface-enhanced Raman scattering. Furthermore, the nucleation and growth mechanism for PPy electropolymerization on this silver-modified roughened gold substrate was distinguishable from that on the unmodified one.

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