Potentiometric Ag+-sensors based on conjugated polymers

Johan Bobacka 1Zekra Mousavi 1Ari Ivaska 1Andrzej Lewenstam 1,2

1. Abo Akademi University, Process Chemistry Centre, Laboratory of Analytical Chemistry, Biskopsgatan 8, Turku FIN-20500, Finland
2. AGH University of Science and Technology, Faculty of Materials Science and Ceramics (AGH UST), Mickiewicza 30, Kraków 30-059, Poland

Abstract

Conjugated, electrically conducting, polymers are multifunctional materials that are of great interest in the area of chemical sensors [1], including potentiometric ion sensors [2,3]. For many years, one of the main challenges has been to obtain functionalized conjugated polymers showing high selectivity towards specific ions. We have found that conjugated polymers, including polypyrrole (PPy), poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3-octylthiophene) (POT), show a selective potentiometric response to silver(I) ions in aqueous solution [4-6]. The selectivity to Ag+ seems to be a common feature of several conjugated polymers and the doping ions do not play a crucial role. Oxidation of conjugated polymers such as PPy and PEDOT by Ag+ causing electroless deposition of metallic Ag onto the conjugated polymers is well described in the literature [7]. However, we have found that chemically synthesized POT shows a selective response to Ag+ although POT remains in the undoped form, as shown by UV-vis spectroscopy [5]. This indicates that the presence of metallic Ag in the conducting polymer is not a prerequisite for the potentiometric response to Ag+. In the case of POT, the potentiometric response to Ag+ is therefore related mainly to interactions between Ag+ ions and sulfur atoms of the conjugated polymer backbone. Additionally, Ag+ ions may interact via π-coordination with double bonds present in conjugated polymers. Conjugated polymers represent a new class of Ag+-selective membranes.

References:

  1. J. Bobacka,”Conjugated Polymer Chemical sensors” in. C.A. Grimes, E.C. Dickey and M.V. Pishko (eds.), Encyclopedia of Sensors, American Scientific Publishers, California, USA, 2006, Vol. 2, pp. 279-294.
  2. A. Michalska, Anal. Bioanal. Chem., 384 (2006) 391-406.
  3. J. Bobacka, Electroanalysis, 18 (2006) 7-18.
  4. Z. Mousavi, J. Bobacka and A. Ivaska, Electroanalysis, 17 (2005) 1609-1615.
  5. M. Vázquez, J. Bobacka and A. Ivaska, J. Solid State Electrochem., 9 (2005) 865-873. [Erratum: J. Solid State Electrochem., 10 (2006) 1012.]
  6. Z. Mousavi, J. Bobacka, A. Lewenstam and A. Ivaska, J. Electroanal. Chem., 593 (2006) 219-226.
  7. M. Ocypa, M. Ptasinska, A. Michalska, K. Maksymiuk and E.A.H. Hall, J. Electroanal. Chem., 596 (2006) 157-168.

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Presentation: Keynote lecture at SMCBS'2007 International Workshop, by Johan Bobacka
See On-line Journal of SMCBS'2007 International Workshop

Submitted: 2007-08-29 11:39
Revised:   2009-06-07 00:48
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