3D-Drawn Supports for Ion-Selective Electrodes

Abstract

A new concept of easy to make, potentially disposable potentiometric sensors is presented. A thermoprocessable carbon black-loaded, electronically conducting, polylactide polymer composite was used to prepare substrate electrodes of user’s defined shape/arrangement applying a 3D pen in a hot melt process. Covering of the carbon black-loaded polylactide 3D-drawn substrate electrode with a PVC-based ion-selective membrane cocktail results in spontaneous formation of a zip-lock structure with a large contact area. Thus, obtained ion-selective electrodes offer sensors of excellent performance, including potential stability expressed by SD of the mean value of potential recorded equal to ±1.0 mV (n = 6) within one day and ±1.5 mV (n = 6) between five days. The approach offers also high device-to-device potential reproducibility: SD of mean value of E 0 equal to ±1.5 mV (n = 5).

Nanofiber Ion-Selective Membrane-Coated Carbon Paper All-Solid-State Sensors: One Stone, Two Birds

“…This approach allows the application of a nanostructural ion-selective membrane in SC-ISEs for the first time. The new approach allows also avoiding application of transducer layer, a necessary step in all systems proposed so far (except for coated wire type sensors). − …”

“…In order to develop disposable sensors, replacement of metal or glassy carbon supporting electrodes by other systems is needed. Toward this end, screen-printed electrodes, e.g., foil or paper modified (painted, spray coated) with conducting polymer and/or carbon nanostructures, ,− graphene paper, , and 3D drawn/printed polylactide–carbon composites, have been proposed. These systems require the effective insulation of the conducting track from the sample solution.…”

Polymeric membrane potentiometric sensors based on template-removal-free imprinted receptors for determination of antibiotics

“…[1][2][3][4][5] The principle of these electrodes is based on converting the activity of the target ion into a potential signal, and then quantifying the ion activity according to the Nernst equation. 6,7 For ISEs, the key components are lipophilic carriers (usually called ionophores) capable of reversibly binding ions. Over the past few decades, considerable efforts have been devoted to develop new classes of ionophores.…”

Ion-selective electrode-based potentiometric immunoassays for the quantitative monitoring of alpha-fetoprotein by coupling rolling cycle amplification with silver nanoclusters

“…An ion-selective electrode (ISE, a kind of electrochemical sensor) can measure the activity or concentration of ions in solution by using a membrane potential. 10 When it is brought into contact with a solution containing an ion to be measured, a membrane potential directly related to the activity of the ion is generated at the phase interface between the sensitive membrane and the solution. The relationship between the potential of the electrode film and the content of the ions to be measured conforms to the Nernst formula.…”