Enhancement of CNT/PET film adhesion by nano-scale modification for flexible all-solid-state supercapacitors

Yu Jin Kang, Haegeun Chung, Min Seop Kim, Woong Kim

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We demonstrate the fabrication of high-integrity flexible supercapacitors using carbon nanotubes (CNTs), polyethylene terephthalate (PET) films, and ion gels. Although both CNTs and PET films are attractive materials for flexible electronics, they have poor adhesion properties. In this work, we significantly improve interfacial adhesion by introducing nanostructures at the interface of the CNT and PET layers. Simple reactive ion etching (RIE) of the PET substrates generates nano-scale roughness on the PET surface. RIE also induces hydrophilicity on the PET surface, which further enhances adhesive strength. The improved adhesion enables high integrity and excellent flexibility of the fabricated supercapacitors, demonstrated over hundreds of bending cycles. Furthermore, the supercapacitors show good cyclability with specific capacitance retention of 87.5% after 10,000 galvanostatic charge-discharge (GCD) cycles. Our demonstration may be important for understanding interfacial adhesion properties in nanoscale and for producing flexible, high-integrity, high-performance energy storage systems.

Original languageEnglish
Pages (from-to)160-165
Number of pages6
JournalApplied Surface Science
Volume355
DOIs
Publication statusPublished - 2015 Nov 15

Keywords

  • Carbon nanotube
  • Flexible supercapacitor
  • Gel electrolyte
  • Interfacial adhesion
  • Polyethylene terephthalate

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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