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LUAN J J , WANG Q , ZHENG X , et al . Flexible metal/polymer composite films embedded with silver nanowires as a stretchable and conductive strain sensor for human motion monitoring [J ] . Micromachines , 2019 , 10 ( 6 ): 372 . DOI: 10.3390/mi10060372 http://doi.org/10.3390/mi10060372 https://www.mdpi.com/2072-666X/10/6/372 https://www.mdpi.com/2072-666X/10/6/372 To avoid conductive failure due to the cracks of the metal thin film under external loads for the wearable strain sensor, a stretchable metal/polymer composite film embedded with silver nanowires (AgNWs) was examined as a potential candidate. The combination of Ag film and AgNWs enabled the fabrication of a conductive film that was applied as a high sensitivity strain sensor, with gauge factors of 7.1 under the applied strain of 0–10% and 21.1 under the applied strain of 10–30%. Furthermore, the strain sensor was demonstrated to be highly reversible and remained stable after 1000 bending cycles. These results indicated that the AgNWs could act as elastic conductive bridges across cracks in the metal film to maintain high conductivity under tensile and bending loads. As such, the strain sensor engineered herein was successfully applied in the real-time detection and monitoring of large motions of joints and subtle motions of the mouth.

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