Highly stretchable dielectric nanocomposites based on single-walled carbon nanotube/ionic liquid gels

Kiwon Oh, Jang Yeol Lee, Sang Soo Lee, Min Park, Daeheum Kim, Heesuk Kim

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We fabricated a highly stretchable dielectric composite using ionic liquid-based single-walled carbon nanotube gel (IL-SWCNT) as a dielectric filler and polydimethylsiloxane (PDMS) as an elastomer matrix. Transmission electron microscopy images showed that the SWCNTs were highly exfoliated and dispersed in the polymer matrix due to the addition of the ionic liquid (IL). The dielectric constant at 100. Hz of the IL-SWCNT/PDMS composite containing 1.6. wt% SWCNTs was twice that of the SWCNT/PDMS composite without IL, and the dielectric loss was one fifth that of the SWCNT/PDMS composite. In addition, the elastic modulus of the IL-SWCNT/PDMS composite was significantly lower (0.36. MPa at a strain of 20%) and the strain at break was higher (350%) compared to the corresponding values of the SWCNT/PDMS composites due to the plasticizer effects of the IL. These results provide the first feasibility study of the use of IL as both an exfoliation agent and a plasticizer in an effort to simultaneously improve the dielectric and mechanical properties of CNT-filled dielectric elastomers.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalComposites Science and Technology
Publication statusPublished - 2013 Jun 28


  • A. Carbon nanotubes
  • A. Flexible composites
  • A. Polymer-matrix composites (PMCs)
  • B. Electrical properties
  • B. Mechanical properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)


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