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Area of Science:

  • Electrochemistry
  • Nanotechnology
  • Materials Science

Background:

  • Chip-based impact electrochemistry enables nanoparticle detection via microelectrode collisions.
  • Planar microelectrode arrays are limited to surface detection, hindering 3D environmental analysis.

Purpose of the Study:

  • To develop a rapid fabrication process for 3D microelectrode arrays.
  • To enable nanoparticle detection in three-dimensional environments.

Main Methods:

  • Fabrication combines inkjet printing of polyacrylate scaffolds with sputtering and laser-ablation for metal structures.
  • Vertical electrode tips are created via laser-ablation after parylene-C passivation.

Main Results:

  • A fast fabrication process for 3D microelectrode arrays was successfully demonstrated.
  • The 3D micro-ring-electrode arrays were used for single impact recordings of silver nanoparticles.

Conclusions:

  • The developed 3D microelectrode arrays offer a promising platform for nanoparticle detection in 3D environments.
  • This method overcomes the limitations of planar designs for electrochemical sensing.