Self-powered finger motion-sensing structural color display enabled by block copolymer photonic crystal

Taebin Kim, Jae Won Lee, Chanho Park, Kyuho Lee, Chang Eun Lee, Seokyeong Lee, Yeonji Kim, Sohee Kim, Seungbae Jeon, Du Yeol Ryu, Won Gun Koh, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Self-powered user-interactive displays that facilitate the visualization of human information acquired by sensors are of great interest in emerging human–machine interface technology with efficient energy consumption. Herein, a self-powered motion-sensing display capable of simultaneously detecting and visualizing finger motions is presented. Our device is based on a one-dimensional photonic crystal of an interpenetrated hydrogel network block copolymer (IHN-BCP) consisting of alternating water-absorbable and non-absorbable lamellae. Triboelectrification is achieved as a function of relative humidity from 30% to 80%. The direct visualization of the humidity is also achieved through the humidity-dependent structural color of the photonic crystal in the full visible range. Furthermore, the humidity-responsive triboelectrification and structural color of our IHN-BCP photonic crystal facilitates the development of a self-powered finger motion-sensing display where diverse gestures of a finger with natural humidity are quantitatively recognized, such as vertical and sliding motion of the finger with simultaneous visualization of the motions in both contact and non-contact modes.

Original languageEnglish
Article number106688
JournalNano Energy
Publication statusPublished - 2022 Feb

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

All Science Journal Classification (ASJC) codes

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


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