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Crack Control in Biotemplated Gold Films for Wide‐Range, Highly Sensitive Strain Sensing
Author(s) -
Shi Jidong,
Lv Suye,
Wang Liu,
Dai Zhaohe,
Yang Siting,
Zhao Lingyu,
Tian Huihui,
Du Mingde,
Li Hongbian,
Fang Ying
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201901223
Subject(s) - materials science , gauge factor , strain (injury) , sensitivity (control systems) , strain gauge , bending , fabrication , optoelectronics , composite material , nanotechnology , electronic engineering , medicine , alternative medicine , pathology , engineering
Strain sensors with high sensitivity and large sensing range have great potential in a wide range of applications. However, in the design of strain sensors, there is usually a trade‐off between sensitivity and sensing range. Herein, a crack‐based strain sensor with engineered microstructure is facilely prepared through a biotemplating method. Under large tensile strains, randomly distributed microcavities on the strain sensor surface can effectively trap and terminate propagating cracks to prevent catastrophic fracture failure. As a result, the strain sensor shows both wide sensing range (up to 80%) and high sensitivity (gauge factor = 20 at 20% strain, 350 at 80% strain). The strain sensor enables sensitive and reliable detection of both subtle human motions, including wrist pulse and throat vibration, and large motions, such as finger bending. Moreover, a multipixel strain sensor array has been fabricated and applied for both static and dynamic strain mapping. The good sensing performance, together with its easy‐fabrication process, make the biotemplated strain sensor a promising candidate for applications in e‐skins and wearable electronics.