| Summary: | 碩士 === 國立中央大學 === 光電科學與工程學系 === 107 === In this study, the metallization of weft-knitted polyester textile exploiting direct laser writing (DLW) technique in combination of silver-based organometallic ink was reported. Under the irradiation of green laser light (λ = 532 nm), silver was reduced and deposited on polyester fabrics, forming silver wire bundles (hereinafter called silver wires). With the laser power density of 95.2 mW/mm2, lowest resistance R = ~3 Ω/cm was obtained without further sintering process.
To demonstrate the capability of maskless patterning, a 1 cm 1 cm square of the textile was metallized. Following Standard ASTM D257-07, surface resistivity range from s = 69.6 Ω/□ to s = 81.2 Ω/□ were obtained. Compared with ITO, the surface resistivity is just 3-4 times higher showing the great potential for textile-based electromagnetic screening.
The last demonstration is a strain sensor. It is found that the resistance variation of the wire under 100 % strain along the wale and course direction are ~1150 % and ~30 %, respectively. This anisotropic property can be very useful in 2D strain sensing and the highly repeatable stretching-releasing characteristic under high cycles promises many potential applications in the field of smart textile.
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