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Versatile carbon-loaded shellac ink for disposable printed electronics.

Alexandre Poulin1, Xavier Aeby1, Gilberto Siqueira1

  • 1Cellulose and Wood Materials Laboratory, EMPA, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland.

Scientific Reports
|December 11, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel conductive ink using natural shellac as a binder, ideal for disposable electronics. This eco-friendly ink offers stable conductivity and can be printed using industry-standard methods.

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Area of Science:

  • Materials Science
  • Sustainable Electronics
  • Inkjet Printing

Background:

  • Emerging smart packaging demands electronic components with shorter service lives (days vs. years).
  • Traditional materials like metal conductive tracks are resource-intensive and pose environmental concerns for disposable electronics.
  • Petroleum-derived polymers used in conductive inks present economic and environmental challenges.

Purpose of the Study:

  • To develop a sustainable and cost-effective conductive ink for disposable electronics.
  • To replace petroleum-based binders with a natural, water-insoluble alternative.
  • To demonstrate the ink's suitability for industry-relevant printing techniques and sensor applications.

Main Methods:

  • Formulation of a conductive ink using carbon particles dispersed in a shellac solution.
  • Characterization of the ink's electrical properties (conductivity, sheet resistance) and stability.
  • Evaluation of the ink's printability using screen-printing and robocasting methods.
  • Fabrication and testing of printed resistors and capacitors as sensors.

Main Results:

  • The shellac-based conductive ink exhibits a conductivity of 1000 S m⁻¹ and a sheet resistance of 15 Ω sq⁻¹.
  • The ink demonstrates excellent moisture stability.
  • A minimum feature size of 200 μm was achieved with industry-relevant patterning methods.
  • Printed resistors and capacitors functioned effectively as deformation and proximity sensors.

Conclusions:

  • Shellac is a viable natural binder for creating eco-friendly conductive inks.
  • The developed ink is suitable for fabricating functional electronic components for disposable applications.
  • This approach offers a sustainable alternative to conventional conductive materials in electronics manufacturing.