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3D-printed gelled electrolytes for electroanalytical applications.

Andrzej Krempiński1,2, Konrad Rudnicki3, Weronika Korzonek1

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Researchers explored various gelators for 3D printing conductive gels. Agar-agar offered the best electrochemical performance, while guar gum printed most reliably, paving the way for novel gel-based detection devices.

Keywords:
BioprintingDirect ink writingElectroanalysisRobocastingScreen printed electrodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Bioprinting Technologies

Background:

  • Direct ink writing, bioprinting, and robocasting are advanced fabrication techniques.
  • Conductive gel phases are crucial for developing integrated electrochemical devices.

Purpose of the Study:

  • To evaluate different gelators (guar gum, gelatin, agarose, agar-agar) for formulating conductive gels compatible with 3D printing.
  • To assess the electrochemical performance and printability of these gel formulations.
  • To investigate the potential of 3D-printed conductive gel structures for electroanalytical applications.

Main Methods:

  • Formulation of gel phases using background electrolyte (NaCl), redox probe (Fe(CN)63-/4-), and various gel precursors at concentrations from 0.1% to 4%.
  • Evaluation of gel properties including printability (nozzle clogging) and electrochemical reproducibility using a glassy carbon electrode.
  • Direct 3D printing of conductive gelled cubes onto screen-printed electrodes for electroanalytical testing.

Main Results:

  • Guar gum demonstrated excellent printability but yielded less reproducible electrochemical results.
  • Agarose and gelatin formulations showed concentration- and scan-dependent alterations in electrochemical properties.
  • Agar-agar provided the best electrochemical performance but presented significant challenges during 3D printing.
  • 3D-printed conductive gel cubes on screen-printed electrodes achieved good electroanalytical responses with a model redox probe.

Conclusions:

  • The choice of gelator significantly impacts both the 3D printing process and the electrochemical performance of conductive gels.
  • Optimizing gel formulations is key to balancing printability and electrochemical functionality for advanced devices.
  • This study serves as a foundation for developing sophisticated 3D-printed, gel-based electrochemical sensors and detection systems.