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Bio-templated Piezoresistive Yarn for High Sensitivity Movement Monitoring Textiles.

Swarnalok De1, Viivi Mäkelä2, Matteo Iannacchero1

  • 1Department of Chemistry and Materials Science, Aalto University, Aalto, Finland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 23, 2026
PubMed
Summary

Researchers developed sustainable, high-performance piezoresistive sensors using bio-derived co-polyamide-starch yarns and potato virus A bio-templates. These movement-sensing textiles offer enhanced stability and sensitivity for advanced wearable technology.

Keywords:
biotemplatingmovement monitoringpiezoresistive sensorplant virus particlessustainabilitywearable electronics

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Area of Science:

  • Materials Science
  • Biotechnology
  • Wearable Technology

Background:

  • Piezoresistive sensors in textiles are vital for wearable motion monitoring.
  • Existing sensors face challenges in sensitivity, stability, and sustainability due to fossil-based materials.
  • Need for eco-friendly, high-performance alternatives in smart textiles.

Purpose of the Study:

  • To introduce bio-derived co-polyamide-starch (CoPA-SS) yarns as a sustainable substrate for piezoresistive sensors.
  • To utilize potato virus A (PV) particles as bio-templates for silver nanoparticle (AgNP) coating.
  • To develop stable, sensitive, and eco-friendly movement-sensing textiles.

Main Methods:

  • CoPA-SS yarns were functionalized for sensor development.
  • PV particles were used to create uniform AgNP coatings via bio-templating.
  • AgNP networks were covalently attached to CoPA-SS yarn surfaces.
  • Sensor performance was evaluated for sensitivity, stability, and response time.

Main Results:

  • The bio-based sensors demonstrated linear stress-strain behavior (0-50% strain).
  • Achieved a high gauge factor (>400 at 10% strain) and fast response time (150 ms).
  • Exhibited excellent stability over 7000 cycles at 50% strain and successful textile integration.

Conclusions:

  • This pioneering bio-templating approach yields high-performance, sustainable piezoresistive sensors.
  • The CoPA-SS/PV/AgNP system offers a promising pathway for advanced wearable electronics.
  • The developed sensors represent a significant advancement in eco-friendly smart textile technology.