Research ArticleAPPLIED SCIENCE AND ENGINEERING

Self-powered user-interactive electronic skin for programmable touch operation platform

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Science Advances  08 Jul 2020:
Vol. 6, no. 28, eaba4294
DOI: 10.1126/sciadv.aba4294
  • Fig. 1 Concept and processing approach of the SUE-skin.

    (A) Schematic diagram of the SUE-skin, which can convert a touch stimulation into an optical signal visible to the human eye and an electrical signal for machine control simultaneously. IoT, Internet of things. (B) The multiple frames at different timestamps (1 to 7) and the time-lapse optical photo (8) of the visual output under the sliding touch. (C) The chromaticity diagram calculated from the emission spectrum of SUE-skin. (D) Stability and repeatability test of the SUE-skin’s luminescence feature by 1000 cycles. (E) The voltage output of the SUE-skin under sliding touch stimuli. (F) Process flow diagram for device fabrication. (G) The SUE-skin was subjected to different mechanical deformations sequentially, which was (i) original, (ii) bent, (iii) rolled, (iv) folded, and (v) released. Scale bars, 1 cm. a.u., arbitrary units. Photo credit for (B) and (G): Xuan Zhao, University of Science and Technology Beijing.

  • Fig. 2 The triboelectric-optical model.

    (A) Schematic diagram of the physical model of the triboelectric-optical effect in contact-separation mode. (B) Light intensity and output voltage of the SUE-skin under different pressures. (C) Light intensity and output voltage of the SUE-skin under different prestress. (D) The spectrogram of triboluminescence (TL) of the SUE-skin. (E) The spectrogram of electroluminescence (EL) of the synthesized ZnS: Cu, Al powder. (F) The spectrogram of room temperature photoluminescence (PL) of the synthesized ZnS: Cu, Al powder.

  • Fig. 3 Performance optimization of the SUE-skin.

    (A) The position of different materials in the triboelectric series. (B) The output electrical and optical signals of the SUE-skin when different materials are used as binders. (C) The output electrical and optical signals of the SUE-skin before and after the reactive ion etching (RIE) process. (D) The output electrical and optical signals of the SUE-skin when the mixing ratio of ZnS and Ecoflex is different. (E) The output electrical and optical signals of the SUE-skin when the thickness of the composite is different.

  • Fig. 4 Demonstration of the programmable touch operation platform by tracks recognition.

    (A) Schematic diagram of the four-electrode SUE-skin. (B) Optical photograph and electrodes schematic of the SUE-skin. (C) Schematic diagram of the programmable control module. (D) Touch operation demonstration for audio playback. (E) Touch operation demonstration for the characters displaying. Photo credit for (B), (D), and (E): Xuan Zhao, University of Science and Technology Beijing.

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