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dc.contributor.authorJiang, Yingen_US
dc.contributor.authorLiu, Zhiyuanen_US
dc.contributor.authorMatsuhisa, Naojien_US
dc.contributor.authorQi, Dianpengen_US
dc.contributor.authorLeow, Wan Ruen_US
dc.contributor.authorYang, Huien_US
dc.contributor.authorYu, Jiancanen_US
dc.contributor.authorChen, Gengen_US
dc.contributor.authorLiu, Yaqingen_US
dc.contributor.authorWan, Changjinen_US
dc.contributor.authorLiu, Zhuangjianen_US
dc.contributor.authorChen, Xiaodongen_US
dc.identifier.citationJiang, 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.201706589en_US
dc.description.abstractStretchable 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.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.relation.ispartofAdvanced Materialsen_US
dc.rightsThis 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.en_US
dc.titleAuxetic mechanical metamaterials to enhance sensitivity of stretchable strain sensorsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science & Engineeringen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsMechanical Metamaterialsen_US
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