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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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Piezoresistive tactile sensor discriminating multidirectional forces

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Title
Piezoresistive tactile sensor discriminating multidirectional forces
Author
Jung, YoungdoLee, Duck-GyuPark, JonghwaKo, HyunhyubLim, Hyuneui
Keywords
Carbon nanotube; Interlocking microdome; Multidirectional detection; Piezoresistive; Shear force; Tactile sensor
Issue Date
201510
Publisher
MDPI AG
Citation
SENSORS, v.15, no.10, pp.25463 - 25473
Abstract
Flexible tactile sensors capable of detecting the magnitude and direction of the applied force together are of great interest for application in human-interactive robots, prosthetics, and bionic arms/feet. Human skin contains excellent tactile sensing elements, mechanoreceptors, which detect their assigned tactile stimuli and transduce them into electrical signals. The transduced signals are transmitted through separated nerve fibers to the central nerve system without complicated signal processing. Inspired by the function and organization of human skin, we present a piezoresistive type tactile sensor capable of discriminating the direction and magnitude of stimulations without further signal processing. Our tactile sensor is based on a flexible core and four sidewall structures of elastomer, where highly sensitive interlocking piezoresistive type sensing elements are embedded. We demonstrate the discriminating normal pressure and shear force simultaneously without interference between the applied forces. The developed sensor can detect down to 128 Pa in normal pressure and 0.08 N in shear force, respectively. The developed sensor can be applied in the prosthetic arms requiring the restoration of tactile sensation to discriminate the feeling of normal and shear force like human skin. © 2015 by the authors; licensee MDPI, Basel, Switzerland
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DOI
http://dx.doi.org/10.3390/s151025463
ISSN
1424-8220
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ECHE_Journal Papers
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