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

• DOI: 10.1002/smll.201803411
• Publication Date: 2018-11-12T08:06:35Z
• Authors: Kahyun Sun; Hangil Ko; Hyun‐Ha Park; Minho Seong; Sang‐Hyeon Lee; Hoon Yi; Hyung Wook Park; Tae‐il Kim; Changhyun Pang; Hoon Eui Jeong
• Keywords: Piezoresistive effect; Gauge factor; Microscale chemistry; Bend radius; Nanomaterials

Abstract Low‐dimensional nanomaterials are widely adopted as active sensing elements for electronic skins. When the integrated with microscale architectures, performance of skin is significantly altered. Here, it shown that a high‐performance flexible and stretchable can be produced by incorporating piezoresistive carbon nanotube composite into hierarchical topography micropillar–wrinkle hybrid architectures mimic wrinkles folds in human skin. Owing to unique exhibits versatile superior performance, which includes multiaxial force detection (normal, bending, tensile stresses), remarkable sensitivity (20.9 kPa −1 , 17.7 mm gauge factor 707 each normal, ultrabroad range (normal stress = 0–270 kPa, bending radius curvature 1–6.5 mm, strain 0–50%), tunability, fast response time (24 ms), high durability (>10 000 cycles). Measurements spatial distributions diverse mechanical stimuli also demonstrated multipixel The stress–strain behavior structure investigated finite element analysis elucidate underlying principle