Journal
ADVANCED ENGINEERING MATERIALS
Volume 24, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202101448
Keywords
highly stretchable materials; long-term stability; PEDOT; PSS fibers; wearable sensors
Categories
Funding
- National Natural Science Foundation of China [21504033]
- China Postdoctoral Science Foundation [2015M580296]
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions of China (TAPP)
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Highly conductive and stretchable PEDOT:PSS fibers were successfully achieved by incorporating urea and soluble copper salts, which not only enhanced their electroconductivity and stretchability, but also provided long-term stability. The obtained fibers exhibited fast response time and ultra-low detection limit, showing potential applications for wearable electronic textiles.
Substantial progress has been made in exploring the novel structures and sensing mechanisms for wearable sensors, where high sensitivity plays an essential role. For fiber-based wearable sensors, the sensitivity mainly depends on the electroconductivity and surface microstructure of fibers. However, preparing highly conductive fibers along with excellent stretchability and long-term stability via facile and effective approaches is still challenging. Therefore, in this work, wet-spun poly (3, 4-ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) fibers with a superior conductivity of 105 S cm(-1) and exceptional stretchability of 132% have been successfully achieved by adding urea and soluble copper salts into a coagulation bath. With the additional copper ions, the formation of a copper complex with fluff-like arrays morphology occurs spontaneously on the surface of fibers, while the existence of urea not only enhances their electroconductivity and stretchability, but also endows both with long-term stability. Meanwhile, the obtained fibers reveal fast response time and ultra-low detection limit to the external stimuli, and braided fabrics decorated with such fibers own potential applications for wearable electronic textiles. More importantly, this work explores the significance of durability for PEDOT:PSS fiber-based devices, inspiring a unique path for novel fiber design.
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