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Updated: Jun 13, 2025

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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AgNPs with CNTs to construct multifunctional flexible sensor with dual conductive network structure.

Yufei Lao1, Qiaoyan Wei1, Suijun Xiao1

  • 1Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education/Guangxi Key Laboratory of Natural and Biomedical Polymer Materials, Guilin University of Technology, Guilin 541004, China.

International Journal of Biological Macromolecules
|September 14, 2024
PubMed
Summary

This study presents a multifunctional film for smart devices, offering stable sensing and antimicrobial properties. The novel nanocellulose-based sensor demonstrates excellent conductivity, electrothermal, and strain-sensing capabilities for flexible electronics.

Keywords:
Composite filmDual conductive network structureIn situ reductionSensor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Flexible sensors are crucial for smart devices but often lack signal stability and multifunctionality.
  • Existing flexible sensors face limitations in durability and integrated functionalities.
  • Developing advanced materials is key to overcoming these challenges in flexible electronics.

Purpose of the Study:

  • To fabricate a multifunctional film with a dual conductive network structure.
  • To evaluate the conductivity, antimicrobial, electrothermal, and strain-sensing properties of the developed film.
  • To demonstrate the potential of the multifunctional film in flexible electronic applications.

Main Methods:

  • Fabrication of a multifunctional film (PM) using nanocellulose crystal dispersed with silver nanoparticles and carbon nanotubes.
  • Characterization of the film's conductivity, antimicrobial activity against bacteria, electrothermal performance, and temperature coefficient of resistance (TCR).
  • Assessment of the sensor's strain sensitivity, durability, and long-term stability under environmental exposure.

Main Results:

  • The PM film achieved excellent conductivity (24.6 S/m) and demonstrated antimicrobial effects against Staphylococcus aureus and Escherichia coli.
  • The sensor exhibited remarkable electrothermal performance (133.1 °C in 50 s at 12 V) with a TCR of -0.65 % °C⁻¹.
  • High strain sensitivity (GF = 1.66), excellent durability (320 cycles), and stable sensing performance after 30 days of air exposure were achieved.
  • The sensor successfully detected minute human body movements at strains as low as 1%.

Conclusions:

  • The fabricated multifunctional film integrates conductivity, antimicrobial properties, electrothermal response, and strain sensing.
  • The dual conductive network structure enhances sensor performance and stability for flexible electronics.
  • The multifunctional PM sensor shows significant promise for advanced applications in wearable devices and smart systems.