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Bio-photocapacitive Tactile Sensors as a Touch-to-Audio Braille Reader and Solar Capacitor

Research output: Contribution to journalArticle

  • Sai Kishore Ravi
  • Nikita Paul
  • Aditya Tjitra Salim
  • Tingfeng Wu
  • Zixuan Wu
  • Michael R Jones
  • Swee Ching Tan
Original languageEnglish
JournalMaterials Horizons
DOIs
DateAccepted/In press - 25 Nov 2019
DatePublished (current) - 25 Nov 2019

Abstract

Human-machine interfaces in emerging smart-skin technologies tend to be focussed towards high-sensitivity tactile sensing primarily with visual/numerical feedback, and research on e-skin technologies for the visually impaired is sparse. Here we demonstrate a proof-of-concept six-pixel tactile sensor that converts touch stimuli based on Braille codes into an auditory output, and which could potentially be miniaturized as an ‘energy-autonomous on-skin e-Braille reader’ for the visually impaired. By applying the concepts of electric double layer capacitance and bio-photo capacitance, a self-powered sensor is constructed that generates electrical signals as large as 2 V by modulating a bio-electrochemical liquid bridge between electrodes of opposite wetting characteristics. The liquid bridge, composed of photosynthetic pigment-proteins with a redox electrolyte, both augments the sensory response and serves as a standalone solar-capacitor that can generate a photocurrent as high as 140 µA cm-2, and which displays a long discharge time of ~20 mins with just ~3 mins of photo charging.

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  • Full-text PDF (author’s accepted manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://doi.org/10.1039/C9MH01798D . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1.52 MB, PDF document

    Embargo ends: 25/11/20

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  • Supplementary information PDF

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://doi.org/10.1039/C9MH01798D . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1.8 MB, PDF document

    Embargo ends: 25/11/20

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