Mechanoreceptor-Inspired Dynamic Mechanical Stimuli Perception based on Switchable Ionic Polarization

Hong Joon Yoon, Dong Min Lee, Young Jun Kim, Sera Jeon, Jae Hwan Jung, Sung Soo Kwak, Jihye Kim, Seong Min Kim, Yunseok Kim, Sang Woo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Diverse touch experiences offer a path toward greater human–machine interaction, which is essential for the development of haptic technology. Recent advances in triboelectricity-based touch sensors provide great advantages in terms of cost, simplicity of design, and use of a broader range of materials. Since performance solely relies on the level of contact electrification between materials, triboelectricity-based touch sensors cannot effectively be used to measure the extent of deformation of materials under a given mechanical force. Here, an ion-doped gelatin hydrogel (IGH)-based touch sensor is reported to identify not only contact with an object but also deformation under a certain level of force. Switchable ionic polarization of the gelatin hydrogel is found to be instrumental in allowing for different sensing mechanisms when it is contacted and deformed. The results show that ionic polarization relies on conductivity of the hydrogels. Quantitative studies using voltage sweeps demonstrate that higher ion mobility and shorter Debye length serve to improve the performance of the mechanical stimuli-perceptible sensor. It is successfully demonstrated that this sensor offers dynamic deformation-responsive signals that can be used to control the motion of a miniature car. This study broadens the potential applications for ionic hydrogel-based sensors in a human–machine communication system.

Original languageEnglish
Article number2100649
JournalAdvanced Functional Materials
Volume31
Issue number23
DOIs
Publication statusPublished - 2021 Jun 2

Bibliographical note

Funding Information:
H.-J.Y. and D.-M.L. contributed equally to this work. This work was financially supported by Nano Material Technology Development Program (2020M3H4A1A03084600) and the Basic Science Research Program (2020R1A2B5B01001785) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT. In addition, this work was funded by Development of Acoustic Sensor based on Piezoelectric Nanomaterials Program (GRRC Sungkyunkwan 2017-B05) from GRRC program of Gyeonggi province.

Funding Information:
H.‐J.Y. and D.‐M.L. contributed equally to this work. This work was financially supported by Nano Material Technology Development Program (2020M3H4A1A03084600) and the Basic Science Research Program (2020R1A2B5B01001785) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT. In addition, this work was funded by Development of Acoustic Sensor based on Piezoelectric Nanomaterials Program (GRRC Sungkyunkwan 2017‐B05) from GRRC program of Gyeonggi province.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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