Stretchable Triboelectric Self‐Powered Sweat Sensor Fabricated from Self‐Healing Nanocellulose Hydrogels

Though visualizing perspiration constituents is crucial for physiological evaluation, inadequate material healing and unreliable power supply methods restrict its applications. Herein, a fully flexible self‐powered sweat sensor is fabricated from a cellulose‐based conductive hydrogel to address thes...

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Bibliographic Details
Published in:Advanced functional materials Vol. 32; no. 27
Main Authors: Qin, Ying, Mo, Jilong, Liu, Yanhua, Zhang, Song, Wang, Jinlong, Fu, Qiu, Wang, Shuangfei, Nie, Shuangxi
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 01.07.2022
Subjects:
Borax
Calcium ions
Cellulose
Healing
hydrogel
Hydrogels
Interface stability
Materials science
Nanocomposites
Perspiration
Polyanilines
Polyvinyl alcohol
Selectivity
self‐powered
Sensitivity analysis
Stability analysis
Stretchability
Sweat
sweat sensors
Triboelectric effect
triboelectric nanogenerators
ISSN:1616-301X, 1616-3028
Online Access:Get full text
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Summary:Though visualizing perspiration constituents is crucial for physiological evaluation, inadequate material healing and unreliable power supply methods restrict its applications. Herein, a fully flexible self‐powered sweat sensor is fabricated from a cellulose‐based conductive hydrogel to address these issues. The hydrogel electrode is composed of a cellulose nanocomposite polymerized in situ with polyaniline and cross‐linked with polyvinyl alcohol/borax. The cellulose nanocomposites furnish the sweat sensor with tensile and electrical self‐healing efficiencies exceeding 95% within 10 s, a stretchability of 1530%, and conductivity of 0.6 S m−1. The sweat sensor quantitatively analyzes Na+, K+, and Ca2+ contents in perspiration, to sensitivities of 0.039, 0.082, and 0.069 mmol–1, respectively, in real time via triboelectric effect and wirelessly transmits the results to a user interface. This fabricated sweat sensor with high flexibility, stability, and analytical sensitivity and selectivity provides new opportunities for self‐powered health monitoring. A conductive hydrogel, cross‐linked by nanocellulose and polyvinyl alcohol demonstrating a highly efficient self‐healing ability (10 s) and excellent tensile properties (1530%) is developed. By applying it as a flexible electrode in a self‐powered sweat sensor, and innovatively utilizing triboelectricity as the working principle, the concentration of Na+, K+ and Ca2+ in sweat can be efficiently detected in real time.
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202201846