Solution process manufacture of a simple, multifunctional flexible sensor based on capacitance measurement

Kwang Wook Choi, Cheol Shin, Sungwoo Jun, Soo Jong Park, Yooji Hwang, Jin Ho Kwak, Young Wook Park, Jong Woong Kim, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review


Conventional sensors are rigid, involve complex processes and structures, and one sensor can detect only one type of stimulus. The manufacturing costs of such devices are high owing to the use of vacuum processes for the formation of thin films and electrodes and the complicated fabrication processes required to construct multiple layers. In addition, the multiple-layer design increases the risk of peeling due to mechanical movement. In this study, to solve the aforementioned problems, a simple two-layer multi-sensor has been fabricated using a non-vacuum solution process. The sensor consists of a light absorption layer comprising polyvinyl butyral and semiconductor particles and a top layer comprising two spiral-shaped Ag nanowire electrodes. The sensor experiences minimal damage by external adhesives and has a light-sensitive optical response at 420 nm and at 1.2 mW cm-2. Herein, the capacitance of the sensor applied to the two-electrode structure was determined, along with the light sensitivity and change in noise with frequency. We believe that the proposed multi-sensor can be applied in a wide range of fields because it can act as a touch sensor and light sensor.

Original languageEnglish
Article number265503
Issue number26
Publication statusPublished - 2021 Jun 25

Bibliographical note

Publisher Copyright:
© 2021 IOP Publishing Ltd.


  • flexible transparent electrodes
  • multifunctional sensors
  • photo sensors
  • photocapacitive
  • touch sensors

ASJC Scopus subject areas

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


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