Photoacoustic effect on the electrical and mechanical properties of polymer-infiltrated carbon nanotube fiber/graphene oxide composites

Ki Ho Nam, Yong O. Im, Hye Jin Park, Haena Lee, Junbeom Park, Sunho Jeong, Seung Min Kim, Nam Ho You, Jae Hak Choi, Haksoo Han, Kun Hong Lee, Bon Cheol Ku

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Direct spinning of carbon nanotube (CNT) fibers is a facile method to produce CNT fibers because of its high productivity and the simplicity of the spinning process from CNT aerogels. Directly spun CNT fibers, however, generally include amorphous carbon and weak shear interaction between tubes or bundles, thereby causing insufficient load transfer. Here, we report newly designed polyimide/reduced graphene oxide (PI/RGO)/CNT fiber composites in combination with polymer infiltration followed by photonic flash sintering on a time scale of 0.5 ms to overcome the critical drawbacks in directly spun CNT fibers. The mechanical performances of the CNT fibers were closely related to the junction strength in CNT bundles. In addition, PI can be interlocked with CNT bundles and effectively serve as a binder to link the GO and CNT fibers with strong interfacial interactions. The PI infiltrated CNT fibers showed the highest load transfer, resulting in a significantly enhanced increase of 83% in specific strength (1.1 N/tex) and a 477% increase in tensile strength (800 MPa) compared to pristine CNT fibers. Furthermore, the photonic sintered PI/RGO/CNT fibers improved electrical conductivity by over 244% (5.5 × 103 S cm−1) over pristine CNT fibers without deteriorating mechanical properties. The results demonstrate that the mechanical strength, modulus and electrical conductivity can be enhanced simultaneously by molecular-level coupling of polymer/graphene with CNT fibers via photonic flash sintering.

Original languageEnglish
Pages (from-to)136-144
Number of pages9
JournalComposites Science and Technology
Publication statusPublished - 2017 Dec 1

Bibliographical note

Funding Information:
This work was supported by grants from the Korea Institute of Science and Technology (KIST) Open Research Program , Nano Material Technology Development Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT, and Industrial Fundamental Technology Development Program ( 10052838 ) by the Ministry of Trade, Industry and Energy (MOTIE) of Korea .

Publisher Copyright:
© 2017 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Engineering(all)


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