Flexible and Stretchable Dual Modes Nanogenerator for Rehabilitation Monitoring and Information Interaction
Motion recognition and information interaction sensors with flexibility and stretchability are crucial functional module as interactive media between the mechanical motions and electric signal in intelligent robot and rehabilitation training system. Nanogenerator has a good application in the field of intelligent interaction with advantages of self-powered sensing ability, easy fabrication, considerable sensitivity and reliability. However, the singularity of the sensing mode limits its application scenarios. Hence, in this paper we develop a flexible and stretchable dual modes nanogenerator (FSDM-NG) based on the integration of piezoelectric and triboelectric principles for human motion sensing and information interaction. In piezoelectric mode，the FSDM-NG can effectively monitor the bending angle of joints（finger, wrist and elbow）from 30° to 90°. In triboelectric mode, the text and logic information transfer are encoded based on the Morse code and logic gate, respectively. Besides，the device has good adhesion, biosafety and robustly which make it works normally even under water environments. Combining these two sensing mechanisms, multiple modes of sensing from touch and stretch based on the FSDM-NG can be achieved for information interaction in real time. The proposed sensor has potential to adapt to more complex sensing, which may provide a new path for intelligent interaction of robots and rehabilitation training field.