Development and application of patterned conducting polymer thin films as chemoresponsive and electrochemically responsive optical diffraction gratings

A. M. Massari, K. J. Stevenson, Joseph T Hupp*

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We describe the preparation of two-dimensionally patterned polyaniline (PANI) thin films via microtransfer molding and electropolymerization techniques. This procedure yields reproducible conducting polymer patterns with excellent feature periodicity, making them useful as diffraction gratings. The fabricated polymer gratings were characterized via tapping-mode atomic force microscopy. Spectroelectrochemistry was used to characterize the optical properties associated with various intrinsic PANI redox states. In accordance with the Kramers-Kronig relation for change-in-absorptivity and change-in-index-of-refraction, electrochemically induced changes in refractive index (detected via changes in diffraction efficiency) were observed to coincide with electrochemically-induced changes in the PANI electronic absorption spectrum. In addition, the higher oxidation states of PANI and the associated changes in refractive index proved accessible via chemical oxidation. Beyond the novelty of a chemically-switchable transmission grating, the response of this system points to the possibility of developing diffraction-based chemical sensing schemes.

Original languageEnglish (US)
Pages (from-to)185-191
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume500
Issue number1-2
DOIs
StatePublished - Mar 16 2001

Keywords

  • Electrochemical sensors
  • Optical diffraction gratings
  • Polyaniline

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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