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Conductive polymer-coated threads as electrical interconnects in e-textiles

Fibers and Polymers volume 12, Article number: 904 (2011) Cite this article

Abstract

An organic polymer electrical interconnect is demonstrated. The ionomer mixture poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS; 1:2.5, w:w) was cast onto silk fibers from a 50:50 (v:v) ethylene glycol solution by a dip-coating process. Dynamic mechanical analysis (DMA) results show that Young’s modulus and mechanical strength are maintained during the coating process from acidic solution (pH ∼1). DMA dynamic temperature scans reveal two new thermal transitions once PEDOT:PSS is applied to the silk fiber, and they are assigned to the glass transition temperature (59 °C) and melting point (146 °C) of the ionomer pair. Electrical conductivities of 8.5 S/cm were achieved with four cycles of the dip-coating process, only 10x less than Ag-coated thread control samples. SEM imaging of the PEDOT:PSS-coated fibers show slight texturing to the fibers due to the coating, as well as significant charging in the uncoated samples when compared to PEDOT:PSS-coated samples. The conductive fibers fabricated by this process were successfully applied as electrical interconnects in flexible, fully functional 555 timer circuits stitched into fabric substrates.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, The University of Texas at El Paso, El Paso, TX, 79968, USA

    Michael D. Irwin, Richard I. Olivas & Eric MacDonald

  2. Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX, 79968, USA

    David A. Roberson

  3. Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX, 79968, USA

    Ryan B. Wicker

  4. W.M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX, 79968, USA

    Michael D. Irwin, David A. Roberson, Richard I. Olivas, Ryan B. Wicker & Eric MacDonald

Authors
  1. Michael D. Irwin
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  2. David A. Roberson
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  3. Richard I. Olivas
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  4. Ryan B. Wicker
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  5. Eric MacDonald
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Correspondence to Michael D. Irwin.

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Irwin, M.D., Roberson, D.A., Olivas, R.I. et al. Conductive polymer-coated threads as electrical interconnects in e-textiles. Fibers Polym 12, 904 (2011). https://doi.org/10.1007/s12221-011-0904-8

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  • DOI: https://doi.org/10.1007/s12221-011-0904-8

Keywords

  • e-textiles
  • Organic electronics
  • Conductive fibers
  • PEDOT:PSS
  • Intrinsically conducting polymers