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Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors.
Adv Mater 2018; 30(12):e1706589AM

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.

Authors+Show Affiliations

Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.Institute of High Performance Computing, Agency for Science, Technology and Research, 1 Fusionopolis Way, 138632, Singapore.Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29380896

Citation

Jiang, Ying, et al. "Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors." Advanced Materials (Deerfield Beach, Fla.), vol. 30, no. 12, 2018, pp. e1706589.
Jiang Y, Liu Z, Matsuhisa N, et al. Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors. Adv Mater Weinheim. 2018;30(12):e1706589.
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 (Deerfield Beach, Fla.), 30(12), pp. e1706589. doi:10.1002/adma.201706589.
Jiang Y, et al. Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors. Adv Mater Weinheim. 2018;30(12):e1706589. PubMed PMID: 29380896.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Auxetic Mechanical Metamaterials to Enhance Sensitivity of Stretchable Strain Sensors. AU - Jiang,Ying, AU - Liu,Zhiyuan, AU - Matsuhisa,Naoji, AU - Qi,Dianpeng, AU - Leow,Wan Ru, AU - Yang,Hui, AU - Yu,Jiancan, AU - Chen,Geng, AU - Liu,Yaqing, AU - Wan,Changjin, AU - Liu,Zhuangjian, AU - Chen,Xiaodong, Y1 - 2018/01/30/ PY - 2017/11/11/received PY - 2017/12/02/revised PY - 2018/1/31/pubmed PY - 2018/1/31/medline PY - 2018/1/31/entrez KW - auxetics KW - high sensitivity KW - mechanical metamaterials KW - stretchable strain sensors SP - e1706589 EP - e1706589 JF - Advanced materials (Deerfield Beach, Fla.) JO - Adv. Mater. Weinheim VL - 30 IS - 12 N2 - 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. SN - 1521-4095 UR - https://www.unboundmedicine.com/medline/citation/29380896/Auxetic_Mechanical_Metamaterials_to_Enhance_Sensitivity_of_Stretchable_Strain_Sensors_ L2 - https://doi.org/10.1002/adma.201706589 DB - PRIME DP - Unbound Medicine ER -