Strain- and humidity-insensitive, stretchable hydrogel-based oxygen sensor with corrosion-free electrodes for wireless oxygen detection.
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| Title: | Strain- and humidity-insensitive, stretchable hydrogel-based oxygen sensor with corrosion-free electrodes for wireless oxygen detection. |
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| Authors: | Lin, Haobin1,2 (AUTHOR), Li, Jianye1 (AUTHOR), Ding, Qiongling1 (AUTHOR), Wang, Hao1 (AUTHOR), Luo, Yibing1 (AUTHOR), Yu, Jiahao3 (AUTHOR), Zhang, He4 (AUTHOR), Yang, Bo-Ru1 (AUTHOR), Tao, Kai1,3,5 (AUTHOR) taokai@nwpu.edu.cn, Liu, Chuan1 (AUTHOR) liuchuan5@mail.sysu.edu.cn, Wu, Jin1,2,4,6,7 (AUTHOR) wujin8@mail.sysu.edu.cn |
| Source: | Sensors & Actuators B: Chemical. Sep2024, Vol. 414, pN.PAG-N.PAG. 1p. |
| Subjects: | Oxygen detectors, Oxygen electrodes, Gas detectors, Detector circuits, Design exhibitions, Platinum electrodes |
| Abstract: | As the public puts higher and higher demands on wearing comfort, wearable gas sensors rapidly advance toward intrinsic flexibility and stretchability. However, many challenges arise during the development of intrinsically stretchable sensors. The deformation of the sensor following the movement of the wearer and uncertain changes in environmental humidity can cause additional interference signals. In addition, severe electrode corrosion also challenges the long-term continuous monitoring of sensors. Here, a stretchable strain- and humidity-insensitive O 2 sensor is proposed by adopting a serpentine hydrogel fiber structure and hydrophobic elastomer encapsulation strategy. Besides, the introduction of the Pt/C electrode and salt immersion strategy effectively eliminate electrode corrosion and electrolyte consumption, significantly prolonging hydrogel sensor's lifespan. Importantly, we propose, for the first time, an oxygen pump mechanism to elucidate positive current transferring and electrode corrosion-free in hydrogel oxygen sensors, which is further validated through well-designed experiments. Optimized sensor exhibits a wide detection range (30 ppm-100%), linear sensitivity (0.03%/ppm), exceptional repeatability and remarkable tolerance towards environmental variations. Integrating oxygen sensor with Bluetooth circuit further enables wireless monitoring of oxygen while confirming its practicality. This research provides insights into improving the interference immunity and longevity of flexible oxygen sensors while showcasing their potential in wearable applications. [Display omitted] ● Oxygen pump-based sensing mechanism is introduced to design hydrogel-based oxygen sensors with high stability. ● Hydrogel fiber and elastomer film encapsulation layer are designed to exhibit strain- and humidity-insensitivity. ● Wireless oxygen monitoring system is developed for the practical and comfortable oxygen detection. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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