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Assessing the Relationships between Interdigital Geometry Quality and Inkjet Printing Parameters.

Federico Bertolucci1, Nicolò Berdozzi1, Lara Rebaioli2

  • 1Industrial Engineering Department, University of Bologna, 40136 Bologna, Italy.

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Summary
This summary is machine-generated.

Optimizing drop on demand (DoD) inkjet printing parameters, specifically drop spacing and nozzle temperature, enhances geometric accuracy for printed electronics. Printing speed did not significantly impact outcomes, allowing for increased productivity.

Keywords:
Design of Experimentadditive manufacturingimage processinginkjet printinginterdigitated electrodes

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Microfabrication

Background:

  • Drop on demand (DoD) inkjet printing is a versatile additive manufacturing technique for microscale geometries.
  • Existing research often focuses on droplet dynamics, with limited systematic studies on parameter-geometrical outcome relationships.
  • Accurate control over process parameters is crucial for reproducible microfabrication in flexible devices and printed electronics.

Purpose of the Study:

  • To investigate the influence of key printing parameters on the geometrical accuracy of interdigitated comb-shape electrodes fabricated using DoD inkjet printing.
  • To establish a systematic approach for correlating process parameters with the precision of printed micrometer-scaled geometries.
  • To identify optimal parameter combinations for achieving high-accuracy electrode patterns.

Main Methods:

  • Utilized Design of Experiments (DoE) methodology for a structured experimental campaign.
  • Systematically varied drop spacing, printing speed, and nozzle temperature.
  • Employed image analysis with a MATLAB algorithm to quantify geometrical accuracy of printed comb-shape electrodes.

Main Results:

  • Identified optimal parameter combinations: a drop spacing of 140 µm and 170 µm in the printing plane directions and a nozzle temperature of 35 °C yielded the most accurate target geometry.
  • Printing speed showed no significant impact on the geometrical outcomes within the tested range.
  • The highest printing speed can be selected to enhance manufacturing throughput without compromising accuracy.

Conclusions:

  • Drop spacing and nozzle temperature are critical parameters for controlling geometrical accuracy in DoD inkjet printing of microelectrodes.
  • Printing speed can be maximized for increased productivity, as it does not adversely affect the precision of the printed geometry.
  • This systematic approach provides valuable insights for optimizing DoD inkjet printing processes for flexible devices and printed electronics.