Piezoresistive sensor for human motion detection based on polyaniline decorated thermally exfoliated graphene oxide

The rigidity and discomfort associated with the use of conventional semiconductor-based wearable devices has prompted increasing interest in hydrogel-based devices. Hydrogels have properties similar to human skin tissue and therefore are more comfortable to use. The present study reports a high-performance, piezoresistive hydrogel nanocomposite-based wearable device towards human motion sensing. The nanocomposites comprise of an optimized distribution of polyaniline (PANI) decorated thermally exfoliated graphene oxide (TEGO) nanofillers incorporated within a biopolymer matrix. The engineered nanofillers endow the hydrogel with synergistic improvement in mechanical and electrical properties, resulting in a combination of high electrical conductance and extraordinary mechanical performance. The material demonstrated high stability during fatigue cycling done for extended periods. Furthermore, these nanostructured materials were used to prepare wearable sensors towards human motion detection. These advanced sensors exhibit a stable, sensitive and repeatable electrical response. Moreover, the use of fully biodegradable raw materials, simple synthesis method, and easy scalability establish the significant potential of the developed material towards wearable devices.