Calcium-selective electrodes based on photo-cured polyurethane-acrylate membranes covalently attached to methacrylate functionalized poly(3,4-ethylenedioxythiophene) as solid-contact

Cristina Ocaña; Natalia Abramova; Andrey Bratov; Tom Lindfors; Johan Bobacka

doi:10.1016/j.talanta.2018.04.056

Calcium-selective electrodes based on photo-cured polyurethane-acrylate membranes covalently attached to methacrylate functionalized poly(3,4-ethylenedioxythiophene) as solid-contact

Talanta. 2018 Aug 15:186:279-285. doi: 10.1016/j.talanta.2018.04.056. Epub 2018 Apr 25.

Authors

Cristina Ocaña¹, Natalia Abramova², Andrey Bratov³, Tom Lindfors⁴, Johan Bobacka⁵

Affiliations

¹ BioMEMs Group, Instituto de Microelectrónica de Barcelona, Centro Nacional de Microelectrónica (IMB-CNM, CSIC), Campus UAB, Bellaterra 08193, Spain; Laboratory of Analytical Chemistry, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Turku-Åbo, Finland.
² BioMEMs Group, Instituto de Microelectrónica de Barcelona, Centro Nacional de Microelectrónica (IMB-CNM, CSIC), Campus UAB, Bellaterra 08193, Spain; Laboratory of Artificial Sensors Systems, ITMO University, Kronverskiy pr. 49, St. Petersburg 197101, Russia.
³ BioMEMs Group, Instituto de Microelectrónica de Barcelona, Centro Nacional de Microelectrónica (IMB-CNM, CSIC), Campus UAB, Bellaterra 08193, Spain. Electronic address: andrei.bratov@imb-cnm.csic.es.
⁴ Laboratory of Analytical Chemistry, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Turku-Åbo, Finland.
⁵ Laboratory of Analytical Chemistry, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Turku-Åbo, Finland. Electronic address: jbobacka@abo.fi.

PMID: 29784361
DOI: 10.1016/j.talanta.2018.04.056

Abstract

We report here the fabrication of solid-contact calcium-selective electrodes (Ca²⁺-SCISEs) made of a polyurethane acrylate ion-selective membrane (ISM) that was covalently attached to the underlying ion-to-electron transducer (solid-contact). Methacrylate-functionalized poly(3,4-ethylenedioxythiophene) (Meth-PEDOT) and Meth-PEDOT films containing either multiwalled carbon nanotubes (MWCNT) or carboxylated MWCNT (cMWCNT) were used as solid contacts. The solid contacts were deposited by drop-casting on screen-printed electrodes and characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and potentiometry. Covalent binding between the solid contact and the ISM was obtained via photopolymerization in order to increase the robustness of the Ca²⁺-SCISEs. The performance of the Ca²⁺-SCISEs was studied by measuring their potentiometric response and their sensitivity to light, oxygen and carbon dioxide. Meth-PEDOT was found to be a promising solid-contact material to develop low-cost and easy to prepare ISEs.

Keywords: 4-ethylenedioxythiophene); All-solid-state ion-selective electrode; Calcium; MWCNT; Polyurethane membrane; Tetramethacrylate poly(3.