Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 369, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.132290
Keywords
Potentiometric sensor; Conductive metal-organic frameworks; Solid-contact; Sweat sensor
Funding
- Suzhou Institute of Nano -Tech and Nano -Bionics, Chinese Academy of Sciences (SINANO) [2020YFB2008501]
- National Key R & D Program of China [61801473, 62071463, 62071462, 22109173]
- National Natural Science Foundation of China [62125112]
- Na- tional Science Fund for Distinguished Young Scholars
- Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences (SINANO)
- National Key R&D Program of China [2020YFB2008501]
- National Natural Science Foundation of China [61801473, 62071463, 62071462, 22109173]
- National Science Fund for Distinguished Young Scholars [62125112]
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In this study, a new fiber-type flexible potentiometric sensor platform based on conductive metal-organic framework composite carbon nanotubes fiber was proposed, and a stable solid-contact sodium ion-selective electrode with nanowire arrays was successfully constructed. This research provides an efficient and convenient way to construct reliable fiber-type potentiometric sensors for wearable applications.
Fiber-type solid-contact ion-selective electrodes (SC-ISE) show unique superiorities for flexible and wearable sweat sensors with excellent wearing experiences. However, it is still challenging to construct high-quality fiber-type SC-ISE with robust sensing properties and facile fabrication methods. Here, we propose a new fiber-type flexible potentiometric sensor platform based on the conductive metal-organic framework (MOF) composite carbon nanotubes fiber (CNTF). The vertically aligned Nickel triphenylene-fused metal catecholate (NiCAT) nanowires arrays are in situ grown on CNTF through a bottom-up one-step hydrothermal synthetic approach. Nafion coating is designed to improve the surface hydrophobicity for avoiding the aqueous layer formation at the solid-contact=ion-selective-membrane interface. The well-defined solid-contact transducer of Nafion/NiCAT@CNTF exhibits the greatly enlarged double-layer capacitance (34.39 mF/cm(2)) attributed to its ordered porous architecture and low contact impedance. Consequently, the as-prepared Na+-ISE displays a sensitive near-Nernstian response of 58.69 +/- 0.77 mV/dec, an excellent long-term potential stability with an ultralow drift of 8.1 +/- 4.1 mu V/h, and a good electrode-to-electrode reproducibility E-0 of 308.0 +/- 3.1 mV. An integrated wearable band-based sweat sensor device was developed for on-body sweat sodium monitoring during exercise. This platform provides an efficient and facile approach to construct reliable fiber-type potentiometric sensors for wearable applications.
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