Affiliation:
1. School of Materials Science and Engineering North University of China Taiyuan 030051 P. R. China
2. School of Mechatronic Engineering North University of China Taiyuan 030051 P. R. China
Abstract
AbstractIn recent years, hydrogels have attracted extensive attention in smart sensing owing to their biocompatibility and high elasticity. However, it is still a challenge to develop hydrogels with excellent multiple responsiveness for smart wearable sensors. In this paper, a facile synthesis of carbon quantum dots (CQDs)‐doped cross‐linked chitosan quaternary/carboxymethylcellulose hydrogels (CCCDs) is presented. Designing of dual network hydrogels decorated with CQDs provides abundant crosslinking and improves the mechanical properties of the hydrogels. The hydrogel‐based strain sensor exhibits excellent sensitivity (gauge factor: 9.88), linearity (R2: 0.97), stretchable ability (stress: 0.67 MPa; strain: 404%), good cyclicity, and durability. The luminescent properties are endowed by the CQDs further broaden the application of hydrogels for realizing flexible electronics. More interestingly, the strain sensor based on CCCDs hydrogel demonstrates photo responsiveness (ΔR/R0≈20%) and pH responsiveness (pH range ≈4–7) performance. CCCDs hydrogels can be used for gesture recognition and light sensing switch. As a proof‐of‐concept, a smart wearable sensor is designed for monitoring human activities and detecting pH variation in human sweat during exercise. This study reveals new possibilities for further applications in wearable health monitoring.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry
Cited by
11 articles.
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