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A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires
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Homogeneity Permitted Robust Connection for Additive Manufacturing Stretchable Electronics.

Qi-Qi Fu1, Tao Zhou1, Ying Chen1

  • 1Institute of Flexible Electronics Technology of THU, Zhejiang, Jiaxing 314000, China.

ACS Applied Materials & Interfaces
|September 1, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a new strategy for robust flexible electronics by using the same material for different functions, enhancing connection strength and device reliability. This approach simplifies fabrication and improves performance in stretchable electronics.

Keywords:
additive manufacturingrobust interfacestrain sensorstretchable electronics

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Area of Science:

  • Materials Science
  • Flexible Electronics
  • Nanotechnology

Background:

  • Interfacial issues like delamination and cracking are critical challenges in flexible electronics due to material property mismatches.
  • Robust connections with high interfacial strength and low impedance are essential for reliable flexible and stretchable devices.

Purpose of the Study:

  • To propose and demonstrate a novel strategy for achieving robust interfacial connections in flexible electronics by employing material homogeneity.
  • To explore the implementation of different functionalities within the same material components, eliminating the need for interlayers.

Main Methods:

  • Investigated the uniformity of carbon nanotube (CNT) within a thermoplastic polyurethane (TPU) elastomer matrix.
  • Fabricated two types of CNT-TPU composites (CTCs) with varying CNT uniformity but identical weight fractions (15 wt %).
  • Utilized additive manufacturing to create a fractal-patterned epidermis device for practical application demonstration.

Main Results:

  • Achieved significant differences in conductivity (281-fold), Young's modulus (7.1-fold), and strain sensitivity (15.7-fold) by tuning CNT uniformity.
  • Demonstrated the use of fabricated CTCs as both strain sensors and interconnectors in all-CNT-based stretchable electronics.
  • Confirmed the robustness of the connection through polymer chain entanglement and percolation network reconstruction at the interface.

Conclusions:

  • The homogeneity strategy offers a facile method for creating robust interfaces in flexible electronics without additional interlayers.
  • The developed CNT-TPU composites exhibit tunable properties suitable for diverse roles in stretchable electronic systems.
  • The fabricated epidermis device highlights the practical utility of this approach for sensitive monitoring of physiological signals and body motion.