Electrochemical polymerization of 9-fluorenecarboxylic acid and its electrochromic device application


Bezgin B., CİHANER A., ÖNAL A. M.

THIN SOLID FILMS, vol.516, no.21, pp.7329-7334, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 516 Issue: 21
  • Publication Date: 2008
  • Doi Number: 10.1016/j.tsf.2008.02.003
  • Title of Journal : THIN SOLID FILMS
  • Page Numbers: pp.7329-7334
  • Keywords: electrochemical polymerization, spectroelectrochemistry, electrochromic device, 9-fluorenecarboxylic acid, VERSATILE ELECTROACTIVE POLYMERS, POLYFLUORENES, ELECTROSYNTHESES, COMPLEXES, EMISSION, FLUORENE, FAMILY, FILMS

Abstract

Poly(9-fluorenecarboxylic acid) (PFCA) was synthesized by electrochemical oxidation of 9-fluorenecarboxylic acid (FCA) using a mixture of nitromethane and boron trifluoride diethyl etherate as the solvent and tetrabutylammonium tetrafluoroborate as the supporting electrolyte. An insoluble and conducting brownish-orange film was deposited on the electrode surface, both during repetitive cycling and constant potential electrolysis at 1.15 V. Characterization of the polymer film has been carried out using Fourier Transform Infrared spectroscopy technique and thermal behavior was studied via thermal gravimetric analysis. Structural analysis showed that the polymerization of FCA occurred at 2,7-position. Spectroelectrochemical behavior of the polymer film on indium tin oxide working electrode was studied by recording the electronic absorption spectra, in-situ, in monomer-free electrolytic solution at different potentials and it is found that the PFCA film can be reversibly cycled between 0.0 V and 1.2 V Furthermore, a dual type electrochromic device based on PFCA was constructed and its spectroelectrochemical properties were investigated. The electrochromic device exhibits color change from transparent to dark blue with a good open circuit memory. (c) 2008 Elsevier B.V. All rights reserved.