One-step metallization of weft-knitted fabrics for wearable biaxial strain sensors

Chao-Yi Tai (Lead / Corresponding author), Chun-Yu Lin, Tang-Chun Liu, Lu-Chiang Jia, Thomas Jones, Amin Abdolvand

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Abstract

One-step direct patterning of high definition conductive tracks in textiles is realized through laser direct writing in combination with a silver organometallic ink developed in-house. Photoreduction, nano-crystallization, and sintering are accomplished in one pass under the irradiation of a CW green laser light (λ = 532 nm) at moderate intensities (I ≥ 95 mW/mm2). By tailoring the surface tension and viscosity of the ink, high-definition conductive tracks are formed in weft-knitted polyester-Spandex composite fabrics, well-following the laser’s profile with negligible coffee stain effect. Length resistance as low as 4 Ω/cm is measured and anisotropy of the gauge factor as high as 25 is achieved. The metallized fabric exhibits reversible and hysteresis-free electromechanical responses subject to high strains. Durability assessment qualifies that the as-metallized strain sensors are able to sustain their performance for over 5000 stretch/release cycles, demonstrating its potential applications in biaxial strain sensing and interactive smart textiles.

Original languageEnglish
Article number20029
Number of pages9
JournalScientific Reports
Volume12
DOIs
Publication statusPublished - 21 Nov 2022

Keywords

  • Design, synthesis and processing
  • Laser material processing
  • Sensors and biosensors

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