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All-in-one, wireless, fully flexible sodium sensor system with integrated Au/CNT/Au nanocomposites

Authors
 Hyo-Ryoung Lim  ;  Yongkuk Lee  ;  Kathryn A .Jones  ;  Young-Tae Kwon  ;  Shinjae Kwon  ;  Musa Mahmood  ;  Soon Min Lee  ;  Woon-Hong Yeo 
Citation
 SENSORS AND ACTUATORS B-CHEMICAL, Vol.331 : 129416, 2021-03 
Journal Title
 SENSORS AND ACTUATORS B-CHEMICAL 
ISSN
 0925-4005 
Issue Date
2021-03
Keywords
All-in-one flexible electronics ; Wearable sodium sensor ; Ion-selective electrode ; High capacitance transducer ; Functionalized carbon nanotube
Abstract
Advancements in functional nanomaterials and wearable electronics have demonstrated the use of solid-state ion-selective electrodes (SS-ISEs) for human health applications. Existing devices, however, still rely on separate and multiple components of flexible sensors, interconnectors, and rigid data acquisition units, which limits the wearability of the entire system on the skin for continuous analyte monitoring. Here, this paper introduces an all-in-one, wireless, fully flexible, sodium detection system that integrates gold-carbon nanotube-gold (Au/CNT/Au) sensors and flexible thin-film circuits, together on a soft elastomeric membrane. The nanocomposite sensor includes electrochemically deposited Au nanoparticles on a CNT transducer to improve the conductivity, capacitance, and interfacial contact between materials. A set of experimental electrochemical analysis confirms the high stability of the SS-ISE based on Au/CNT/Au nanocomposites. At the same time, the thin-film system shows mechanical robustness and reliability, even with repetitive bending up to 500 cycles. The fully flexible, sensor-circuit integrated system demonstrates stable sodium measurements when mounted on the skin with minimized motion artifacts. The measured sensitivity of the sodium sensor is 55.5 ± 0.3 mV/decade, along with less than 3% change when the entire device is mounted on the skin with continuous movements. Overall, the presented comprehensive study, including nanomaterials, nano-microfabrication, electrochemistry, and electronics, shows the enormous potential of the wireless all-in-one sensor system for seamless integration with various types of skin-mounted wearable health monitors.
Full Text
https://www.sciencedirect.com/science/article/pii/S0925400520317561
DOI
10.1016/j.snb.2020.129416
Appears in Collections:
1. College of Medicine (의과대학) > Others (기타) > 1. Journal Papers
Yonsei Authors
Lee, Soon Min(이순민) ORCID logo https://orcid.org/0000-0003-0174-1065
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/182080
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