Self-healable Conductive Nanocellulose Nanocomposites for Biocompatible Electronic Skin Sensor System
作者：Lian Han, Songbo Cui, Hou-Yong Yu, Mei-Li Song, Haoyu Zhang, Nathan Grishkewich, Congguo Huang, Daes
關鍵字：cellulose nanocrystals，cellulose nanofibers，polypyrrole; nanocomposites，skin sensors
論文來源：期刊
具體來源：ACS Applied Materials & Interfaced
發表時間：2019年
Electronic skins are developed for applications such as biomedical sensors, robotic prosthetics and human-machine interactions, which raises the interests in composite
materials that possess both flexibility and sensing properties. Polypyrrole (PPy) coated cellulose nanocrystals (CNCs) and cellulose nanofibers (CNFs) were prepared using iron (III) chloride (FeCl3) oxidant were used to reinforce polyvinyl alcohol (PVA). The combination of weak H-bonds, iron co-ordination bonds and the synergistic effect of these components yielded self-healing nanocomposite films with robust mechanical strength (409% increase compared to pure PVA and high toughness up to 407.1%), and excellent adhesion (9670 times greater than its own weight) to various substrates in air and water.When damaged, the nanocomposite displayed good mechanical (72.0-76.3%) and
conductive recovery (54.9-91.2%) after a healing time of 30 min. More importantly, the flexible nanocomposites possessed high strain sensitivity under subtle strains (than the gauge factor of ionic hydrogel-based skin sensors. This nanocomposite film possessed superior sensing performance for real-time monitoring of large and subtle human motions (finger bending motions, swallowing and wrist pulse), thus they have great potentials in health monitoring, smart flexible skin sensors and wearable electronic devices.