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A rubberlike stretchable active matrix using elastic conductors.

Tsuyoshi Sekitani1, Yoshiaki Noguchi, Kenji Hata

  • 1Quantum-Phase Electronics Center, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

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This study developed a flexible, stretchable conductor using single-walled carbon nanotubes (SWNTs) dispersed in a copolymer. The resulting material maintains mechanical properties and enables the creation of stretchable electronic circuits for diverse applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing flexible and stretchable electronic materials is crucial for next-generation devices.
  • Incorporating conductive fillers into polymer matrices often compromises mechanical properties.

Purpose of the Study:

  • To create a highly conductive and stretchable composite material using single-walled carbon nanotubes (SWNTs).
  • To integrate this material into a rubberlike active matrix for stretchable electronics.

Main Methods:

  • Uniformly dispersed SWNTs in a vinylidene fluoride-hexafluoropropylene copolymer matrix using an ionic liquid.
  • Coated the SWNT composite film with dimethyl-siloxane-based rubber.
  • Integrated the elastic conductor with printed organic transistors to form an active matrix.

Main Results:

  • Achieved high SWNT content (up to 20 wt%) without sacrificing mechanical flexibility.
  • The SWNT composite film exhibited a conductivity of 57 S/cm and 134% stretchability.
  • The active matrix could be stretched by 70% biaxially and uniaxially without damage.

Conclusions:

  • Developed a robust, stretchable conductor with excellent electrical and mechanical properties.
  • Demonstrated the potential for fabricating large-area, rubberlike active matrices for flexible electronics.
  • This technology enables electronic circuits on curved and moving surfaces, such as robotic joints.