In this work, Ti 3 C 2 MXene supported by cotton fabric was used as electrode layer to construct a novel triboelectric nanogenerator (TENG) as self-powered flexible sensors. The electrode layer was made by immersing cotton fabric in the mixing suspension of Ti 3 C 2 MXene and cellulose nanofibers (CNFs). In the electrode layer, Ti 3 C 2 MXene provides the electrical conductivity and electrical negativity. The fabric substrate provides the strength and flexibility of the electrode layer. The MXene on the surface of electrode layer can lose electrons if it frictionally contacts the friction layer of TENG, silicone rubber. The TENG can produce open-circuit voltage up to 400 V in single-electrode mode during the press-release cycles of a human’s palm. The harvested energy can directly power 32 green light emitting diodes connected in series and charge capacitors. The TENG can sense the mass of touched steel object (2–200 g) with good repeatability and linear relationship. The TENG can be stretched up to 100 % of the original length and can produce different voltage signals according to the bending/folding angles. The TENG exhibits excellent flexibility and sensing performance to be applied as self-powered flexible sensors to monitor various physiological movements of the human body.
Hongsen Niu,Yuke Chen,Eun-Seong Kim,Weijia Zhou,Yang Li,Nam-Young Kim
The development of capacitive tactile sensors with both ultrasensitivity and ultrafast response/relaxation is crucial for the development of intelligent healthcare monitoring technology. Despite the significant improvement in the sensing performance presented by the introduction of microstructures into the dielectric or electrode layers, meeting the demands of intellectualization remains a major challenge. Herein, a strategy to simultaneously introduce microstructures in both the dielectric and electrode layers is developed. The hierarchical sea-urchin TiO 2 particle-in-micropore (HSP-MP) structure in the dielectric layer induces stress concentration near the micropore regions, significantly enhancing the sensitivity and toughness of the device. The sparsely spaced large microcone improves the sensitivity of the hierarchical microcone (HM) structure in the electrode layer, while the small microcone reduces the hysteresis caused by interfacial adhesion. With the synergistic effect of the HSP-MP&HM structure, the proposed tactile sensor achieves ultrasensitivity of 10.5 kPa −1 , ultrafast response/relaxation time of 5.6/5.6 ms, and ultralow limit of detection of 0.1 Pa. These sensing properties are demonstrated in practical applications, including tiny signal perception of the human fingertip pulse, tiny muscle motion perception for Morse code transmission, and high-resolution flexible perception array with pressure mapping capability.
危险品化学品经营许可证（带存储）