Electrode potential-dependent colorimetric response of fluorescein-modified layer-by-layer films in the presence of hydrogen peroxide

Munenari Nagasaka, Kentaro Yoshida, Katsuhiko Sato, Tomonori Hoshi, Jun ichi Anzai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Layer-by-layer (LbL) thin films composed of fluorescein-modified poly(allylamine) (F-PAH) and poly(styrenesulfonic acid) (PSS) were prepared on the surface of an indium-tin oxide (ITO) electrode and the electrode potential-dependent colorimetric response of the LbL films was studied in the presence of hydrogen peroxide (H2O2). The LbL films were prepared by an alternate deposition of F-PAH and PSS on the surface through an electrostatic force of attraction. The LbL films exhibited a UV-visible absorption band around 500nm originating from fluorescein residues in the film and the intensity of the absorption band depended on the pH of the solution to which the LbL film is exposed. The absorbance of the film was higher at neutral pH than that in weakly acidic solutions. The intensity of the absorption band decreased when an electrode potential higher than 0.6V was applied in the presence of H2O2, while virtually no response was observed at lower electrode potential. The colorimetric response was suppressed in solutions with higher buffer capacity. The results were rationalized on the basis of the changes in local pH at the vicinity of the electrode surface, which in turn was induced by electrolysis of H2O2 on the electrode surface. A possible application of the system for colorimetric sensing of H2O2 was discussed.

Original languageEnglish
Pages (from-to)441-445
Number of pages5
JournalJournal of Colloid And Interface Science
Volume348
Issue number2
DOIs
Publication statusPublished - 2010 Aug 1

Keywords

  • Colorimetric response
  • Electrode potential
  • Fluorescein
  • Hydrogen peroxide
  • Layer-by-layer film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Electrode potential-dependent colorimetric response of fluorescein-modified layer-by-layer films in the presence of hydrogen peroxide'. Together they form a unique fingerprint.

Cite this