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A simple and industrially scalable method for making a PANI-modified cellulose touch sensor.

I Ragazzini1, I Gualandi1, S Selli2

  • 1Department of Industrial Chemistry "Toso Montanari", Bologna University, Viale Risorgimento 4, I-40136, Bologna, Italy.

Carbohydrate Polymers
|December 28, 2020
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Summary

Researchers developed a low-cost, scalable paper process for conductive cellulose fibers coated with polyaniline. This creates highly conductive electroactive sheets with potential for green, high-tech electronic devices.

Keywords:
CelluloseElectro-active paperPANITouch sensorTransducers

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Conductive materials are crucial for advanced electronics.
  • Developing cost-effective and sustainable conductive materials remains a challenge.
  • Cellulose-based materials offer a promising, eco-friendly alternative.

Purpose of the Study:

  • To present a simple, scalable industrial paper process for conductive cellulose fiber sheets.
  • To coat cellulose fibers with polyaniline via in situ oxidative polymerization.
  • To fabricate and characterize electroactive sheets for electronic applications.

Main Methods:

  • In situ oxidative polymerization of polyaniline onto bare cellulose fibers.
  • Fabrication of electroactive sheets from the composite fibers.
  • Resistivity measurements and device prototyping (capacitive touch sensor).

Main Results:

  • Achieved sheet resistivity of 14 ± 1 Ω sq-1, significantly lower than literature values.
  • Demonstrated superior electronic properties in a capacitive touch sensor.
  • The sensor exhibited a 3-4% increase in capacitance upon compression with a 52 ms response time.

Conclusions:

  • The developed process yields highly conductive, electroactive cellulose-polyaniline composite sheets.
  • This method offers a significant improvement for low-cost, green, and high-tech electronic devices.
  • This represents a novel approach to fabricating electronic components from sustainable materials.