Current-direction-controllable Ag-embedded stretchable layers to enhance and extend the applicability of stretchable sensors

Eunji LeeHeena KimSehyeon KimShin, Hyun JoonJinki HongHyunwoo JoeWoojin KimYoungbaek KimTaewon HaSankar Prasad BagHye Jin KimJinsik Kim
Issue Date
Elsevier BV
Sensors and Actuators, B: Chemical, v.401
We suggest a multi-layered stretchable sensor with a carbon nanotube (CNT) layer enclosed by an embedded layer of silver (Ag-Ecoflex), and show how it can be used in biomedical applications. The current direction can be controlled along the vertical or lateral axis on the Ag-Ecoflex layer by adjusting the composite Ag ratio; the CNT layer can determine electrical conductivity from the bypassed current path. The multi-layered stretchable sensor can ensure electrical conductivity up to a maximum strain of 245% with a high resistance change of 3782% when Ag-Ecoflex concentration was increased to 60 wt%, showing an electrical resistance of 71.64 Ω/mm along its vertical axis. The sensor functioned normally on a heated state and for up to three weeks on an immersed state possessing a linear characteristic; it can be used for sensor calibration. We confirmed its reliability by 1000 cycles of the strain-release test, detected body motions and tissue swelling, applied it to intravesical cystometric test, and verified compatibility with analog-to-digital conversion in real-time. Resulting, this sensor can secure both high sensitivity and modulus of elasticity, proposing the stability of sensor by simulating the external environment and internal human body. This proposed multi-layered stretchy sensor is anticipated to have a wide range of wearable monitoring device applications.
Stretchable sensor; Strain sensor; Carbon nanotube; Ag-embedded layer; Current direction control; Multi-layered sensor
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