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Scalable and Facile Preparation of Highly Stretchable Electrospun PEDOT:PSS@PU Fibrous Nonwovens towards Wearable Conductive Textile Applications Yichun Ding, Wenhui Xu, Wenyu Wang, Hao Fong, and Zhengtao Zhu ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.7b06726 • Publication Date (Web): 14 Aug 2017 Downloaded from http://pubs.acs.org on August 14, 2017
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ACS Applied Materials & Interfaces
Scalable and Facile Preparation of Highly Stretchable Electrospun PEDOT:PSS@PU Fibrous Nonwovens towards Wearable Conductive Textile Applications Yichun Ding,† Wenhui Xu,‡ Wenyu Wang,§ Hao Fong,*,†,‡ and Zhengtao Zhu*,†,‡,§ †
Biomedical Engineering PhD Program, South Dakota School of Mines and Technology, Rapid
City, SD 57701, USA. ‡
Department of Chemistry and Applied Biological Sciences, South Dakota School of Mines and
Technology, Rapid City, SD 57701, USA. §
State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile,
Tianjin Polytechnic University, Tianjin 300387, China. KEYWORDS. Stretchable conductor, PEDOT:PSS, Conductive nonwoven, Conductive elastomeric fibers, Electrospinning, Dip-coating
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ABSTRACT. Flexible and stretchable conductive textiles are highly desired for potential applications in wearable electronics. This study demonstrates a scalable and facile preparation of all-organic nonwoven that is mechanically stretchable and electrically conductive. Polyurethane (PU) fibrous nonwoven is prepared via the electrospinning technique; in the following step, the electrospun
PU
nonwoven
is
dip-coated
with
the
conducting
ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS).
polymer
poly(3,4-
This simple method enables
convenient preparation of PEDOT:PSS@PU nonwovens with initial sheet resistance in the range of 35~240 Ω/ sq (i.e., the electrical conductivity in the range of 30~200 S m-1) by varying the number of dip-coating times. The resistance change of the PEDOT:PSS@PU nonwoven under stretch is investigated. The PEDOT:PSS@PU nonwoven is first stretched and then released repeatedly under certain strain (denoted as pre-stretching strain); the resistance of PEDOT:PSS@PU nonwoven becomes constant after the irreversible change for the first 10 stretch-release cycles. Thereafter, the resistance of the nonwoven does not vary appreciably under stretch as long as the strain is within the pre-stretching strain.
Therefore, the
PEDOT:PSS@PU nonwoven can be used as a stretchable conductor within the pre-stretching strain.
Circuits using sheet and twisted yarn of the nonwovens as electric conductors are
demonstrated.
1. INTRODUCTION Flexible electronics, such as portable and wearable devices of power generation, energy storage, display, and sensor, have attracted great interests in recent years.1-6 In the wearable devices, flexible and stretchable conductors are needed not only as the active materials but also
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ACS Applied Materials & Interfaces
as the connectors and interconnectors among different components.7
Researchers have
developed numerous materials/methods for preparation of flexible conductors, most of which focus on coating or incorporating metals, carbon materials, or conducting polymers in elastomers.7-10
For example, construction of buckled/wrinkled structures in an elastomer
provides an effective method for enabling stretchable conductors.11-13 However, the elastomeric conductive composites usually have limited degrees of stretch strain (
