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. 2022 Mar 1;94(8):3436-3440.
doi: 10.1021/acs.analchem.1c05431. Epub 2022 Feb 17.

3D-Drawn Supports for Ion-Selective Electrodes

Justyna Kalisz  1 , Katarzyna Wȩgrzyn  1 , Krzysztof Maksymiuk  1 , Agata Michalska  1
Affiliations

3D-Drawn Supports for Ion-Selective Electrodes

Justyna Kalisz et al. Anal Chem. .

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 E0 equal to ±1.5 mV (n = 5).

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Schematic representation of sensors preparation: (A) insulating layer prepared using a PLA filament. (B) CB-PLA conductive track and support is drawn; pictures show the conductive track (left) and PLA-isolated conductive track leaving the exposed substrate. The substrate electrode can be of any shape including, for example, a “pipe type” electrode with the working surface facing up (lower picture). (C) Membrane is drop cast.
Figure 2
Figure 2
SEM images of surface of CB-PLA deposited film; inset is PLA.
Figure 3
Figure 3
Fluorescence microscopy image of (A) cross section of dye containing ISM and CB-PLA. (B–D) Front views of CB-PLA surface post removing of ISM and after applying sand paper polishing.
Figure 4
Figure 4
Potentiometric responses of 3D-K+-ISE electrode (within one day reproductibility) error bars show ± SD for n = 6 calibrations performed during one day. Inset: between days reproductibility error bars show ± SD for n = 6 calibrations performed during five days.
See this image and copyright information in PMC

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