Please use this identifier to cite or link to this item:
Title: Auxetic mechanical metamaterials to enhance sensitivity of stretchable strain sensors
Authors: Jiang, Ying
Liu, Zhiyuan
Matsuhisa, Naoji
Qi, Dianpeng
Leow, Wan Ru
Yang, Hui
Yu, Jiancan
Chen, Geng
Liu, Yaqing
Wan, Changjin
Liu, Zhuangjian
Chen, Xiaodong
Keywords: Engineering::Materials
Issue Date: 2018
Source: Jiang, Y., Liu, Z., Matsuhisa, N., Qi, D., Leow, W. R., Yang, H., … Chen, X. (2018). Auxetic mechanical metamaterials to enhance sensitivity of stretchable strain sensors. Advanced Materials, 30(12), 1706589-. doi: 10.1002/adma.201706589
Journal: Advanced Materials 
Abstract: Stretchable strain sensors play a pivotal role in wearable devices, soft robotics, and Internet-of-Things, yet these viable applications, which require subtle strain detection under various strain, are often limited by low sensitivity. This inadequate sensitivity stems from the Poisson effect in conventional strain sensors, where stretched elastomer substrates expand in the longitudinal direction but compress transversely. In stretchable strain sensors, expansion separates the active materials and contributes to the sensitivity, while Poisson compression squeezes active materials together, and thus intrinsically limits the sensitivity. Alternatively, auxetic mechanical metamaterials undergo 2D expansion in both directions, due to their negative structural Poisson's ratio. Herein, it is demonstrated that such auxetic metamaterials can be incorporated into stretchable strain sensors to significantly enhance the sensitivity. Compared to conventional sensors, the sensitivity is greatly elevated with a 24-fold improvement. This sensitivity enhancement is due to the synergistic effect of reduced structural Poisson's ratio and strain concentration. Furthermore, microcracks are elongated as an underlying mechanism, verified by both experiments and numerical simulations. This strategy of employing auxetic metamaterials can be further applied to other stretchable strain sensors with different constituent materials. Moreover, it paves the way for utilizing mechanical metamaterials into a broader library of stretchable electronics.
ISSN: 1521-4095
DOI: 10.1002/adma.201706589
Schools: School of Materials Science & Engineering 
Rights: This is the peer reviewed version of the following article: Jiang, Y., Liu, Z., Matsuhisa, N., Qi, D., Leow, W. R., Yang, H., … Chen, X. (2018). Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors. Advanced Materials, 30(12), 1706589. doi: 10.1002/adma.201706589, which has been published in final form at 10.1002/adma.201706589. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

Citations 1

Updated on May 20, 2024

Web of ScienceTM
Citations 1

Updated on Oct 24, 2023

Page view(s) 50

Updated on May 21, 2024

Download(s) 5

Updated on May 21, 2024

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.