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Bending Sensor Based on Controlled Microcracking Regions for Application toward Wearable Electronics and Robotics

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Download Hi-Res ImageDownload to MS-PowerPointCite This:ACS Appl. Mater. Interfaces 2022, 14, 27, 31312-31320
    Applications of Polymer, Composite, and Coating Materials

    Bending Sensor Based on Controlled Microcracking Regions for Application toward Wearable Electronics and Robotics
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    • Do Hoon Lee
      Do Hoon Lee
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      More by Do Hoon Lee
    • Jun Chang Yang
      Jun Chang Yang
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      More by Jun Chang Yang
    • Joo Yong Sim
      Joo Yong Sim
      Department of Mechanical Systems Engineering, Sookmyung Women’s University, Seoul 04310, Republic of Korea
      More by Joo Yong Sim
    • Heemin Kang
      Heemin Kang
      Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
      More by Heemin Kang
      Orcidhttps://orcid.org/0000-0003-2694-9882
    • Hyung-Ryong Kim*
      Hyung-Ryong Kim
      Department of Pharmacology, College of Dentistry, Jeonbuk National University, Jeonju 54896, Republic of Korea
      *Email: [email protected]
      More by Hyung-Ryong Kim
    • Steve Park*
      Steve Park
      Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
      *Email: [email protected]
      More by Steve Park
      Orcidhttps://orcid.org/0000-0002-1428-592X
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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2022, 14, 27, 31312–31320
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    https://doi.org/10.1021/acsami.2c07795
    Published June 28, 2022
    Copyright © 2022 American Chemical Society
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    Abstract

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    A soft bending sensor based on the inverse pyramid structure is demonstrated, revealing that it can effectively suppress microcrack formation in designated regions, thus allowing the cracks to open gradually with bending in a controlled manner. Such a feature enabled the bending sensor to simultaneously have a wide dynamic range of bending strain (0.025–5.4%), high gauge factor (∼74), and high linearity (R2 ∼ 0.99). Furthermore, the bending sensor can capture repeated instantaneous changes in strain and various types of vibrations, owing to its fast response time. Moreover, the bending direction can be differentiated with a single layer of the sensor, and using an array of sensors integrated on a glove, object recognition was demonstrated via machine learning. Finally, a self-monitoring proprioceptive ionic electroactive polymer (IEAP) actuator capable of operating in liquid was demonstrated. Such features of our bending sensor will enable a simple and effective way of detecting sophisticated motion, thus potentially advancing wearable healthcare monitoring electronics and enabling proprioceptive soft robotics.

    Copyright © 2022 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.2c07795.

    • Additional details of the working principle of the IPBS, finite element simulation images, characterizations of the IPBS, IEAP actuator fabrication process, schematic of the measurement setup, and SEM images (PDF)

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    ACS Applied Materials & Interfaces

    Cite this: ACS Appl. Mater. Interfaces 2022, 14, 27, 31312–31320
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsami.2c07795
    Published June 28, 2022
    Copyright © 2022 American Chemical Society
    Request reuse permissions

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