Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2600298


Hybrid integration of flexible temperature and humidity sensors with crosstalk decoupling for wearable physiological monitoring


Author(s):  Mengran LIU, Ziming LI, Yingying DAI, Chongjie JIANG, Junwen HUANG, Zhenghong LUO, Jinhui ZHANG, Wei ZHOU, Wendi GAO, Tao LUO

Affiliation(s):  1. Hubei Key Laboratory of Modern Manufacturing Quality Engineering, School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, China more

Corresponding email(s):   luotao@xmu.edu.cn, wendi_gao@mail.xjtu.edu.cn

Key Words:  Flexible sensors, Temperature-humidity monitoring, Crosstalk decoupling, Epidermal electronics, Physiological mon-itoring


Mengran LIU, Ziming LI, Yingying DAI, Chongjie JIANG, Junwen HUANG, Zhenghong LUO, Jinhui ZHANG, Wei ZHOU, Wendi GAO, Tao LUO. Hybrid integration of flexible temperature and humidity sensors with crosstalk decoupling for wearable physiological monitoring[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%A Junwen HUANG
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%A Wei ZHOU
%A Wendi GAO
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A1 - Junwen HUANG
A1 - Zhenghong LUO
A1 - Jinhui ZHANG
A1 - Wei ZHOU
A1 - Wendi GAO
A1 - Tao LUO
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DOI - 10.1631/jzus.A2600298


Abstract: 
Accurate, synchronous monitoring of respiratory and cutaneous temperature and humidity is essential for assessing pulmonary function and exercise-induced metabolic status. However, miniaturized flexible sensors often suffer from tempera-ture-humidity crosstalk, which degrades measurement reliability. Here, we present a flexible temperature-humidity sensor that achieves crosstalk decoupling through hybrid integration of thermoelectric temperature sensing and capacitive humidity sensing, combined with algorithmic compensation. A three-dimensional interconnected copper-constantan thin-film thermocouple is fabricated on a polyimide substrate for temperature measurement. On the same substrate, a capacitive humidity sensor is constructed using laser-induced graphene interdigital electrodes and a graphene oxide sensing layer. Leveraging the intrinsic immunity between ionic and electronic conduction mechanisms, together with compensation algorithms, real-time decoupled sensing is achieved. The device exhibited an average humidity sensitivity of 31 pF/%RH and a temperature sensitivity of 29.88 uV/C, with fast response and recovery. A flexible printed circuit-based acquisition module with wireless transmission is further developed for wearable operation. Demonstrations in respiration monitoring and exercise metabolic assessment scenarios confirm the reliable capture of temperature-humidity dynamics, highlighting the potential of the proposed sensor for wearable healthcare applications.

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