Conductive Core-shell Aramid Nanofibrils: Compromising Conductivity with Mechanical Robustness for Organic Wearable Sensing.

One-dimensional organic nanomaterials with the combination of electric conductivity, flexibility and mechanical robustness have been highly in demand in a variety of flexible electronic devices. Herein conducting polymers were combined with robust Kevlar nanofibrils (aramid nanofibrils, abbreviated as ANFs) via in-situ polymerization. Owing to strong interactions between ANFs and conjugated polymers, the resultant core-shell ANFs showed high electric conductivity in combination with flexibility, robustness, physical stability and endurance to bending and solvents, in sharp contrast to many inorganic conductive nanomaterials. Due to their responsivity of conductivity to different stimuli (e.g. humidity and strain), their membranes were capable not only of sensing human motions and speech words, but also of showing high sensitivity to variation of environmental humidity. In such way, these core-shell ANFs may pave a way of combining both conductivity and mechanical properties applicable for diverse wearable devices.