Iontronic tactile sensors with ion diffusing P/N charged layers for enhanced piezoionic performances.
발표자
()
초록
내용
Piezoionic effect refers to the generation of electric potential and current in response to external mechanical stimuli, resulting from uneven local distribution of ions in ionic polymer composites. Unlike other self-powered sensing mechanisms, it has been utilized in electromechanical sensors for simultaneous perception of static and dynamic forces. However, piezoionic sensors have certain limitations, including low-output signals and slow response times. In this study, we propose a multilayered piezoionic sensor with an ion diffusion layer achieved by sandwiched stacking of P-N charged polymers. This stacking enables the formation of an ion diffused charge gradient in the ionic composite due to the electrostatic attraction of the surface. The charge gradient allows for gradual control of the ion pair attraction force, leading to high sensitivity and fast response behavior under minute physical stimuli. As a result, the sensor exhibits highly improved piezoionic performance with 450 nA and 100 ms of response times.