4.8 Article

Omnidirectional Configuration of Stretchable Strain Sensor Enabled by the Strain Engineering with Chiral Auxetic Metamaterial

Journal

ACS NANO
Volume 17, Issue 21, Pages 22035-22045

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.3c08624

Keywords

auxetic mechanical metamaterial; stretchable strainsensors; omnidirectionally enhanced sensitivity; negative Poisson's ratio; wearable healthcare; smart training assistant

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The incorporation of a chiral auxetic metamaterial (CAM) into the elastomer substrate of a stretchable strain sensor significantly enhances its sensitivity and omnidirectional sensing ability. The regulation mechanism associated with crack propagation on the deformed substrate is revealed through finite element simulations and experiments. The demonstration of on-body monitoring of human physiological signals and a smart training assistant for trampoline gymnastics further illustrates the benefits of omnidirectionally enhanced performance.
An electromechanical interface plays a pivotal role in determining the performance of a stretchable strain sensor. The intrinsic mechanical property of the elastomer substrate prevents the efficient modulation of the electromechanical interface, which limits the further evolution of a stretchable strain sensor. In this study, a chiral auxetic metamaterial (CAM) is incorporated into the elastomer substrate of a stretchable strain sensor to override the deformation behavior of the pristine device and regulate the device performance. The tunable isotropic Poisson's ratio (from 0.37 to -0.25) achieved by the combination of CAM and elastomer substrate endows the stretchable strain sensor with significantly enhanced sensitivity (53-fold improvement) and excellent omnidirectional sensing ability. The regulation mechanism associated with crack propagation on the deformed substrate is also revealed with finite element simulations and experiments. The demonstration of on-body monitoring of human physiological signals and a smart training assistant for trampoline gymnastics with the CAM-incorporated strain sensor further illustrates the benefits of omnidirectionally enhanced performance.

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