18 January, 2015
Semi-metallic, strong and stretchable wet-spun conjugated polymer microfibers
Jian Zhou, Er Qiang Li, Ruipeng Li, Xuezhu Xu, Isaac Aguilar Ventura, Ali Moussawi, Dalaver H. Anjum, Mohamed Nejib Hedhili, Detlef-M. Smilgies, Gilles Lubineau and Sigurdur T. Thoroddsen
Abstract
A dramatic improvement in electrical conductivity is necessary to make conductive polymer fibers viable candidates in appli- cations such as flexible electrodes, conductive textiles, and fast-response sensors and actuators. In this study,
high-performance poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) conjugated polymer microfibers were fabricated via wet-spinning followed by hot-drawing. Due to the combined effects of the vertical hot-drawing process and doping/de-doping
the microfibers with ethylene glycol (EG), we achieved a record electrical conductivity of 2804 S•cm-1. This is, to the best of our knowledge, a six-fold improvement over the best previously reported value for PEDOT/PSS fibers (467 S•cm-1)
and a two-fold improvement over the best values for conductive polymer films treated by EG de-doping (1418 S•cm-1). Moreover, we found that these highly conductive fibers experience a semiconductor-metal transition at 313 K. They also have superior
mechanical properties with a Young’s modulus up to 8.3 GPa, a tensile strength reaching 409.8 MPa and a large elongation before failure (21%). The most conductive fiber also demonstrates an extraordinary electrical performance during stretching/unstreching:
the conductivity increased by 25% before the fiber rupture point with a maximum strain up to 21%. Simple fabrication of the semi- metallic, strong and stretchable wet-spun PEDOT/PSS microfibers described here could make them available for conductive
smart electronics.
http://pubs.rsc.org/en/content/articlepdf/2014/TC/C4TC02354D?page=search