10.1021/acs.analchem.9b01286.s001 Dawid Kałuża Dawid Kałuża Ewa Jaworska Ewa Jaworska Maciej Mazur Maciej Mazur Krzysztof Maksymiuk Krzysztof Maksymiuk Agata Michalska Agata Michalska Multiwalled Carbon Nanotubes–Poly(3-octylthiophene-2,5-diyl) Nanocomposite Transducer for Ion-Selective Electrodes: Raman Spectroscopy Insight into the Transducer/Membrane Interface American Chemical Society 2019 all-solid-state electrodes membrane phase transducer material sensor performance application MWCNT ion-selective electrodes transducer materials approach Raman Spectroscopy Insight Raman spectroscopy membrane composition carbon nanotubes Ion-Selective Electrodes sensor phases multiwalled carbon nanotubes all-solid-state ion-selective electrodes Transducer 2019-06-14 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Multiwalled_Carbon_Nanotubes_Poly_3-octylthiophene-2_5-diyl_Nanocomposite_Transducer_for_Ion-Selective_Electrodes_Raman_Spectroscopy_Insight_into_the_Transducer_Membrane_Interface/8337461 An approach to overcome drawbacks of well-established transducer materials for all-solid-state ion-selective electrodes is proposed; it is based on the formulation of the nanocomposite of multiwalled carbon nanotubes (MWCNTs) and poly­(3-octylthiophene-2,5-diyl) (POT), in which the polymer is used as a dispersing agent for carbon nanotubes. Thus, the obtained material is characterized with unique properties that are important for its application as solid contact in ion-selective electrodes, including high: electronic conductivity, capacitance, and lipophilicity. Performance of the obtained all-solid-state electrodes was studied using a standard approach as well as Raman spectroscopy to allow insight into distribution of the transducer material within the sensor phases: the membrane and the transducer. Application of the composite prevents unwanted partition of POT to the membrane phase, thus eliminating the risk of alteration of the sensor performance due to uncontrolled change in the membrane composition.