Journal
CARBOHYDRATE POLYMERS
Volume 250, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116905
Keywords
Polyacrylic acid; Nanocellulose; Hydrogel; Self-healable; Graphene; Sensing ability
Categories
Funding
- National Natural Science Foundation of China [31770609]
- Natural Science Foundation of Jiangsu Province for Outstanding Young Scholars [BK20180090]
- Qing Lan Project of Jiangsu Province (2019)
- Priority Academic Program Development (PAPD)
- 333 Project Foundation of Jiangsu Province [BRA2018337]
- Analysis and Test Center of Nanjing Forestry University
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Stretchable, self-healing and conductive hydrogels have attracted much attention for wearable strain sensors, which are highly required in health monitoring, human-machine interaction and robotics. However, the integration of high stretchability, self-healing capacity and enhanced mechanical performance into one single conductive hydrogel is still challenging. In this work, a type of stretchable, self-healing and conductive composite hydrogels are fabricated by uniformly dispersing TEMPO-oxidized cellulose nanofibers (TOCNFs)-graphene (GN) nanocomposites into polyacrylic acid (PAA) hydrogel through an in-situ free radical polymerization. The resulting hydrogels demonstrate a stretchability (similar to 850 %), viscoelasticity (storage modulus of 32 kPa), mechanical strength (compression strength of 2.54 MPa, tensile strength of 0.32 MPa), electrical conductivity (similar to 2.5 S m(-1)) and healing efficiency of 96.7 % within 12 h. The hydrogel-based strain sensor shows a high sensitivity with a gauge factor of 5.8, showing great potential in the field of self-healing wearable electronics.
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