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Journal of Solid State Electrochemistry

, Volume 9, Issue 12, pp 865–873 | Cite as

Potentiometric sensors for Ag+ based on poly(3-octylthiophene) (POT)

  • Mercedes Vázquez
  • Johan Bobacka
  • Ari Ivaska
Original Paper

Abstract

Potentiometric ion sensors were prepared from the conjugated polymer poly(3-octylthiopene) (POT). The influence of additional membrane components, including silver 7,8,9,10,11,12-hexabromocarborane (AgCB11H6Br6) and potassium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (KTpFPB) as lipophilic salts, and [2.2.2]p,p,p-cyclophane as silver ionophore, was studied. The membrane components were dissolved in chloroform and membranes were prepared by solution casting on glassy carbon disk electrodes. For comparison, POT-based potentiometric sensors were also prepared by galvanostatic electrosynthesis of POT from the 3-octylthiophene monomer. All the POT-based ion sensors fabricated by solution casting show Nernstian or slightly sub-Nernstian response to Ag+, even those based only on POT without any additional membrane components. The potentiometric response of electrochemically polymerized POT depends on the film thickness and the doping anion incorporated in the conducting polymer during polymerization. It is of particular importance that chemically synthesized undoped POT (without any additives) shows a sensitive and selective potentiometric response to Ag+ ions although UV-vis results show that POT remains in its undoped form, i.e., POT is not oxidized by Ag+. This indicates that undoped POT can exhibit good sensitivity and selectivity to Ag+ also in the absence of metallic silver in the polymer film. In this case, the potentiometric response is related to interactions between Ag+ and the conjugated polymer backbone.

Keywords

Ion-selective electrode Silver Poly(3-octylthiophene) Conducting polymer 

Notes

Acknowledgements

The authors are grateful to Dr. Carita Kvarnström for the fruitful discussions. Financial support from the National Technology Agency (TEKES) and the Academy of Finland are gratefully acknowledged. This work is part of the activities at the Åbo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Programme (2000–2005) by the Academy of Finland.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Process Chemistry Centre, c/o Laboratory of Analytical ChemistryÅbo Akademi UniversityÅbo-TurkuFinland
  2. 2.Graduate School of Materials Research (GSMR)Åbo Akademi UniversityÅbo-TurkuFinland

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