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Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
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  • Biomimetics

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Hybrid Architectures of Heterogeneous Carbon Nanotube Composite Microstructures Enable Multiaxial Strain Perception with High Sensitivity and Ultrabroad Sensing Range

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Title
Hybrid Architectures of Heterogeneous Carbon Nanotube Composite Microstructures Enable Multiaxial Strain Perception with High Sensitivity and Ultrabroad Sensing Range
Author
Sun, KahyunKo, HangilPark, Hyun-HaSeong, MinhoLee, Sang-HyeonYi, HoonPark, Hyung WookKim, Tae-ilPang, ChanghyunJeong, Hoon Eui
Issue Date
2018-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
SMALL, v.14, no.52, pp.1803411
Abstract
Low‐dimensional nanomaterials are widely adopted as active sensing elements for electronic skins. When the nanomaterials are integrated with microscale architectures, the performance of the electronic skin is significantly altered. Here, it is shown that a high‐performance flexible and stretchable electronic skin can be produced by incorporating a piezoresistive carbon nanotube composite into a hierarchical topography of micropillar-wrinkle hybrid architectures that mimic wrinkles and folds in human skin. Owing to the unique hierarchical topography of the hybrid architectures, the hybrid electronic skin exhibits versatile and superior sensing performance, which includes multiaxial force detection (normal, bending, and tensile stresses), remarkable sensitivity (20.9 kPa−1, 17.7 mm−1, and gauge factor of 707 each for normal, bending, and tensile stresses), ultrabroad sensing range (normal stress = 0-270 kPa, bending radius of curvature = 1-6.5 mm, and tensile strain = 0-50%), sensing tunability, fast response time (24 ms), and high durability (>10 000 cycles). Measurements of spatial distributions of diverse mechanical stimuli are also demonstrated with the multipixel electronic skin. The stress-strain behavior of the hybrid structure is investigated by finite element analysis to elucidate the underlying principle of the superior sensing performance of the electronic skin.
URI
https://scholarworks.unist.ac.kr/handle/201301/25430
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/smll.201803411
DOI
10.1002/smll.201803411
ISSN
1613-6810
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