A novel dual-mode paper fiber sensor based on laser-induced graphene and porous salt-ion for monitoring humidity and pressure of human

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 502; p. 158184
• Main Authors: Liang, Aoxun, Dong, Wenhao, Li, Xiaoyu, Chen, Xueye
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2024
• Subjects: Composite fiber; Decoupling; Dual-mode sensor; Laser-induced graphene; Pressure; Respiratory monitoring; Composite fiber; Respiratory monitoring; Decoupling; Dual-mode sensor; Pressure; Laser-induced graphene
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2024.158184

•Dual-mode Sensor Based on Paper Fibers and Laser-Induced Graphene for Simultaneous Monitoring of Humidity and Pressure.•Utilize the Characteristics of Pore Structure and Salt Ions to Enhance the Sensor’s Response to Humidity.•Design of a Unique Electrode Structure to Achieve Decoupling of Different Signals.•Based on paper fibers, it is low-cost and environmentally friendly, suitable for wearable devices.•Applied in Monitoring Various Aspects Such as Respiration and Movement. The fabrication of low-cost humidity and pressure sensors for flexible sensing remains a challenge, yet the continuous monitoring of human motion signals and moisture dissipation holds significant importance in the field of wearable technology. This study introduces a dual-mode pressure/humidity sensor utilizing paper fibers and carboxymethyl cellulose intertwined with laser-induced graphene and salt ions. This sensor adheres to human skin, enabling simultaneous monitoring of respiratory moisture and surface characteristics. The fabricated dual-mode sensor exhibits high sensitivity (4.2 KPa^-1), with a response time of 300 ms and a recovery time of 200 ms. It also demonstrates high linearity with R12 = 0.94 and R22 = 0.99, and a wide linear range from 19.6 Pa to 39.2 KPa. Furthermore, the sensor can effectively monitor the moisture content of gases, exhibiting high sensitivity to high humidity and resistance to humidity crosstalk. In human health monitoring, it continuously tracks respiratory rate, surface moisture evaporation, and motion status, reflecting the physiological condition of the subject based on skin humidity and pressure states. This capability is invaluable in patient rehabilitation, nursing, and wellness. Therefore, the design and approach presented in this work hold significant implications for the future development and application of wearable respiratory sensors and moisture detectors.