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Journal Article
Current-direction-controllable Ag-embedded stretchable layers to enhance and extend the applicability of stretchable sensors
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- Authors
- Eunji Lee, Heena Kim, Sehyeon Kim, Hyunjoon Shin, Jinki Hong, Hyunwoo Joe, Woojin Kim, Youngbaek Kim, Taewon Ha, Sankar Prasad Bag, Hye Jin Kim, Jinsik Kim
- Issue Date
- 2024-02
- Citation
- Sensors and Actuators, B: Chemical, v.401, pp.1-9
- ISSN
- 0925-4005
- Publisher
- Elsevier BV
- Language
- English
- Type
- Journal Article
- Abstract
- 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.
- KSP Keywords
- Analog-to-Digital Conversion, Biomedical applications, Carbon nano-tube(CNT), Current Path, Current direction, Electrical Conductivity, Electrical resistance, Embedded layer, External environment, High Sensitivity, Human Body