Highly Stretchable, Compressible, Adhesive, Conductive Self-healing Composite Hydrogels with Sensor Capacity
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POLYMER SCIENCE
ARTICLE
https://doi.org/10.1007/s10118-020-2472-0 Chinese J. Polym. Sci.
Highly Stretchable, Compressible, Adhesive, Conductive Self-healing Composite Hydrogels with Sensor Capacity Ji-Jun Wang, Qiang Zhang, Xing-Xiang Ji, and Li-Bin Liu* State Key Laboratory of Biobased Material and Green Papermaking, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Electronic Supplementary Information Abstract The design and fabrication of conductive hydrogels with high stretchability, compressibility, self-healing properties and good adhesion remains a significant challenge. We have fabricated composite hydrogels by random polymerization of acrylic acid (AA) and dopamine (DA) in the presence of multi-walled carbon nanotubes (MWCNTs). The π-π interaction between DA and MWCNTs makes MWCNTs stably and homogenously dispersed in water. The fabricated PAA-PDA/CNT composite hydrogels possess relatively high mechanical strength (maximum Young’s modulus: 800 kPa) and can be stretched to 1280% strain and compressed to 80% strain. The multiple hydrogen bonding formed between functional groups of PAA-PDA and MWCNTs can effectively dissipate energy and quickly achieve self-healing. The composite hydrogels also show good adhesion and can easily adhere to various inorganic or organic surfaces. In addition, the hydrogel reveals stable strain sensitivity and can be used as skin sensors. Keywords Hydrogels; Self-healing; Conductivity; Sensor Citation: Wang, J. J.; Zhang, Q.; Ji, X. X.; Liu, L. B. Highly stretchable, compressible, adhesive, conductive self-healing composite hydrogels with sensor capacity. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-020-2472-0
INTRODUCTION Sensors with stretchability, wearability, flexibility have attracted great research interest because they can be applied to intelligent robots,[1−5] bioelectrodes,[6,7] wearable electronic skins[8−14] and other fields. The wearable smart sensors transfer physical signals such as temperature[15] and strain,[16−18] into electrical signals for transmission and recording, and thus detect various physiological changes or movement changes. In recent years, research on smart sensors has shown a significant increase. Graphene,[19,20] carbon nanotubes,[16,21] conductive polymers[17,22] and other materials have been doped or embedded into the polymer matrix to make smart sensors. Despite their flexibility, many of the sensors are not stretchable or compressible, whereas these properties are important for sensors applied in some special environment. In addition, wearable sensors used in human joint motion detection will inevitably be subject to mechanical damage caused by continuous bending and stretching, so it is necessary to have rapid self-healing and fatigue resistance. Because there is no self-adhesion, many smart sensors require additional fixing devices such as tape to help with adhesion. Therefore, design and fabrication of smart sensors with the above-m
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