Electropolymerization and doping/dedoping properties of polyaniline thin films as studied by electrochemical-surface plasmon spectroscopy and by the quartz crystal microbalance

Akira Baba, Shengjun Tian, Fernando Stefani, Chuanjun Xia, Zhehui Wang, Rigoberto C. Advincula, Diethelm Johannsmann, Wolfgang Knoll

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

The electropolymerization and doping/dedoping properties of polyaniline ultrathin films on Au electrode surfaces were investigated by a combination of in situ electrochemical techniques, i.e., electrochemical surface plasmon spectroscopy (ESPR) and the electrochemical quartz crystal microbalance (EQCM). In the ESPR measurements, we employed two wavelengths, i.e., 632.8 and 1152 nm in order to distinguish independently the electrochromic behavior. In addition, we used spectroelectrochemical transmittance measurements in order to probe further the optical properties of the polymer films as a function of the applied potential. The real and imaginary parts of the dielectric constant of the polyaniline thin film at several doping levels was determined quantitatively by taking into consideration the thickness values obtained from the EQCM measurement. The combination of these two techniques provides a powerful method for probing the electrical, optical, and dielectric properties of conjugated ultrathin polymer films.

Original languageEnglish
Pages (from-to)95-103
Number of pages9
JournalJournal of Electroanalytical Chemistry
Volume562
Issue number1
DOIs
Publication statusPublished - 2004 Jan 15
Externally publishedYes

Keywords

  • Complex dielectric constant
  • Doping/de-doping
  • Electrochromism
  • Polyaniline thin film
  • Quartz crystal microbalance
  • Surface plasmons

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Electropolymerization and doping/dedoping properties of polyaniline thin films as studied by electrochemical-surface plasmon spectroscopy and by the quartz crystal microbalance'. Together they form a unique fingerprint.

  • Cite this