4.8 Article

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

Journal

NANO ENERGY
Volume 92, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.nanoen.2021.106688

Keywords

Human-machine interfaces; Finger motion-sensing display; Block copolymer photonic crystal; Humidity-dependent structural color display; Triboelectric motion sensing; Self-powered operation

Funding

  1. National Research Foundation (NRF) of Korea as a Creative Materials Discovery Program - Ministry of Science and ICT [NRF-2018M3D1A1058536]
  2. Korean gov-ernment (MEST) [2020R1A2B5B03002697]
  3. Korea Initiative for fostering University of Research and Innovation Program of the National Research Foundation (NRF) - Korean government (MSIT) [NRF-2020M3H1A1077207]
  4. KIST Institutional Program [2Z05900-19-P096]
  5. National Research Foundation of Korea [4199990514159, 2020R1A2B5B03002697] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The self-powered motion-sensing display presented in this paper can detect and visualize finger motions, achieve triboelectrification at different humidity levels, and directly visualize humidity through the structural color of a photonic crystal. This innovation facilitates the development of a self-powered finger motion-sensing display capable of quantitatively recognizing various gestures of a finger under natural humidity conditions.
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.

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