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    Modification of Carbon Nanomaterials by Association with Poly(3-octylthiophene-2,5-diyl) as a Method of Improving the Solid-Contact Layer in Ion-Selective Electrodes

    Year: 2022

    Journal: Membranes, Volume 12, DEC

    Authors: Niemiec, Barbara; Piech, Robert; Paczosa-Bator, Beata

    Keywords: ion-selective electrodes; carbon nanofibers; hierarchical nanocomposites; potentiometric sensor; hydrophobic material; high electrical capacity

    A new group of carbon nanomaterials modified with poly(3-octylthiophene-2,5-diyl) for solid-contact layers in ion-selective electrodes was obtained. The materials were characterized by scanning electron microscopy and measurement of the contact angle. The modification greatly improved the hydrophobicity of the materials, and the highest contact angle (175 degrees) was obtained for a polymer-modified carbon nanofibers/nanotube nanocomposite. The electrical parameters of the electrodes were determined using the methods of chronopotentiometry and electrochemical impedance spectroscopy. The highest electrical charge capacity was obtained for polymer-modified carbon nanofibers (7.87 mF/cm(2)). For this material, the lowest detection limit (10(-6.2) M) and the best potential reversibility (SD = 0.2 mV) were also obtained in potentiometric measurements.
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