Constructing stimuli-free self-healing, robust and ultrasensitive biocompatible hydrogel sensors with conductive cellulose nanocrystals
作者：Meili Song, Hou-Yong Yu, Jiaying Zhu, Zhaofeng Ouyang, Somia Yassin Hussain Abdalkarim, Kam Chiu Tam
關鍵字：Multi-branched cellulose nanocrystals， Conductive hydrogel， Self-healing， Sensors
論文來源：期刊
具體來源：Chemical Engineering Journal
發(fā)表時間：2020年
Self-healing conductive hydrogels as artificial skin-like materials hold
great potential applications in the fields of artificial intelligence, soft
robotics and personal healthcare. However, it remained challenging to construct
stimuli-free self-healing biomimetic hydrogels with ultra-stretchability and
excellent sensitivity. Herein, polyaniline was coated on the surface polycarboxylic
multi-branched cellulose nanocrystals (Multi CNC-PANI) via templated polymerization.
Afterword, rod-like Multi CNC-PANI served as a dynamic bridge endowed those hydrogels
hierarchical structure and dynamic hydrogen bond interactions doped with
polyvinyl alcohol (PVA)/borax system. Combined with the dynamic borate ester
bonds, the biomimetic nanocomposite hydrogels had high breaking strength
(171.52 KPa), ultra-stretchability (1085%), rapid self-healing properties,
adhesiveness, decent biocompatibility, and sensitivity. Especially, the hydrogels
could keep good self-healing ability both in air and underwater without any
stimuli, and the self-healing efficiency could reach up to 99.56% within 120 s.
This hydrogel sensor could sensitively detect and distinguish human motions
including swallow, fingers, wrist, elbow and knee joints, in real-time.
Besides, the self-healed hydrogel gave detective signal with uniform and
repeatable sensitivity, which endowed the hydrogels mechanically adaptability
and good store stability. Therefore, the strategy may provide unique
opportunities in designing biomimetic sensors with skin-like mechanical
stretchability, sensitivity and self-healing properties.