Highly sensitive and flexible strain sensors based on patterned ITO nanoparticle channels

Do Hoon Lee, Jonghyurk Park, Jong Kwon Lee, Kwang Heo, Dong Jin Lee, Ye Rim Lee, Byung Yang Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We demonstrate a highly sensitive and flexible bending strain sensor using tin-doped indium oxide (ITO) nanoparticles (NPs) assembled in line patterns on flexible substrates. By utilizing transparent ITO NPs without any surface modifications, we could produce strain sensors with adjustable gauge factors and optical transparency. We were able to control the dimensional and electrical properties of the sensors, such as channel height and resistance, by controlling the NP assembly speed. Furthermore, we were able to generate controlled gauge factor with values ranging from 18 to 157, which are higher than previous cases using metallic Cr NPs and Au NPs. The alignment of the ITO NPs in parallel lines resulted in low crosstalk between the transverse and longitudinal bending directions. Finally, our sensor showed high optical transmittance, up to ∼93% at 500 nm wavelength, which is desirable for flexible electronic applications.

Original languageEnglish
Article number495501
Issue number49
Publication statusPublished - 2017 Nov 15

Bibliographical note

Funding Information:
This project was supported by the Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4909581), and the Center for Integrated Smart Sensors, funded by the Ministry of Science, ICT & Future Planning as Global Frontier Project (CISS-2011-0031866). JHP acknowledges the support of the Ministry of Trade, Industry and Energy (MOTIE) and Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program (No. N0001819).

Publisher Copyright:
© 2017 IOP Publishing Ltd.


  • ITO
  • gauge factor
  • nanoparticle
  • strain sensor
  • tin-doped indium oxide

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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