Journal
ORGANIC ELECTRONICS
Volume 88, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2020.105977
Keywords
Cracks; Ultra-violet adhesive substrate; Dual hydrogen bond-assisted structure; High sensitivity; High stability; Human motion detection
Funding
- National Natural Science Foundation of China [61673369, 61901005, 91648206]
- Anhui Provincial Natural Science Foundation [1908085QF261]
- University Synergy Innovation Program of Anhui Province [GXXT-2019-008]
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A practical and reliable chemical bonding-based dip-coating method was proposed in this study to fabricate a high sensitivity and high stability crack-based flexible strain sensor with dual hydrogen bond-assisted structure. The strain sensor has a sandwich structure and exhibits high sensitivity (gauge factor of 19.65), long-term stability (over 10,000 cycles), good linearity, negligible drift, fast response time (approximately 50 ms), and low detection limit (0.10%).
Owing to their ultrahigh sensitivity, crack-based flexible strain sensors have garnered considerable attention in recent years. In this study, a practical, and reliable chemical bonding-based dip-coating method is proposed to fabricate high sensitivity and high stability crack-based flexible strain sensor with dual hydrogen bond-assisted structure. The strain sensor has a sandwich structure, which is composed of graphene nanoplatelets (GNPs)/poly (sodium-p-styrenesulfonate) (PSS) conductive layer, ultra-violet (UV) adhesive substrate layer, and UV adhesive covering layer. The fabrication process, principle of dual hydrogen bond-assisted structure, strain sensing mechanism, and various properties of the proposed sensor are examined. It is demonstrated that the cracks and the dual hydrogen bond-assisted structure facilitate a practical strain sensor with high sensitivity (gauge factor of 19.65 in the strain range of 0-30%), long-term stability (over 10,000 cycles), good linearity, negligible drift, fast response time (similar to 50 ms), and low detection limit (0.10%). Meanwhile, the proposed crack-based flexible strain sensor can be used as a wearable device, which can be directly mounted on human skin to monitor tiny human motions and writing behavior. Consequently, it exhibits immense potential for wearable applications including artificial skin, human-machine interfaces, and medical healthcare.
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