Flexible, water-proof, wire-type supercapacitors integrated with wire-type UV/NO2 sensors on textiles

Daeil Kim, Kayeon Keum, Geumbee Lee, Doyeon Kim, Sang Soo Lee, Jeong Sook Ha

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


Wire-type devices that can be integrated onto fabrics are being actively studied to meet the demands for various wearable systems. In this study, we report the fabrication of wire-type supercapacitors (WSCs) integrated with wire-type UV/NO2 sensors on textiles. The WSC consists of braided carbon fiber electrodes coated with multi-walled carbon nanotubes (MWNT)/V2O5 nanowires(NWs), a cellulose-based separator, and an ionic-liquid-based electrolyte of [EMIM][TFSI]/LiCl/Al2O3 nanoparticles. This fabricated WSC exhibited good performance with an extended potential window of 1.5 V and areal capacitance of 10.6 mF/cm2 at 0.5 mA/cm2. Very stable electrochemical performance of the WSC was also observed under mechanical deformations of bending, knotting, and folding. In addition, stable WSC performance in water was demonstrated by encapsulation with a thermally-shrinkable tube. Furthermore, μ-light-emitting diodes and wire-type NO2 gas and UV sensors were operated by the integrated multiple WSCs on a textile: The MWNT-coated wool wire detected NO2 gas reproducibly by increase of the current. Using spiropyran and ZnO NWs, changes in both color and photo-current were detected upon UV irradiation. This work demonstrates the great potential of our WSC for use in wearable textile sensor systems as an efficient energy storage device.

Original languageEnglish
Pages (from-to)199-206
Number of pages8
JournalNano Energy
Publication statusPublished - 2017 May 1

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (Grant No. NRF-2016R1A2A1A05004935). We also thank the KU-KIST graduate school program of Korea University.

Publisher Copyright:
© 2017 Elsevier Ltd


  • Electronic textile
  • Integrated power supply
  • Wire-type UV/NO sensor
  • Wire-type supercapacitor

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


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