The conductive hydrogels always suffered from high internal friction, large hysteresis, and low capability of accurately predicting physical deformation, which seriously restricted their application in smart wearable devices. To address these problems, solvent molecules are directionally inserted into the polymer molecule chains via bridge effect to effectively reduce the molecular internal friction. Moreover, swelling is also combined to eliminate the temporary entanglements in the hydrogel system. The cooperation between the bridge and swollen effect endows the prepared polyacrylamide (PAM)/laponite/H 3 BO 3 /ethylene glycol (Eg) organohydrogel (PLBOH) ultralow hysteresis (1.38%, ε = 100%), ultrafast response (≈10 ms), and high linearity in the whole-strain-range (R 2 = 0.996) with a great sensitivity (GF = 2.68 at the strain range of 0-750%). Meanwhile, the prepared PL 10 B 30 OH exhibits long-term stability, excellent stretchability, and low dissipated energy. Furthermore, the assembled triboelectric nanogenerator (TENG) displays an outstanding energy harvesting performance with an output voltage of 200 V with the size of 20 mm × 20 mm. The assembled strain sensors can monitor the small strain of facial expressions and large strain of human movements, indicating the tremendous applications in self-powered intelligent and flexible wearable electronics under harsh environmental conditions.
The hydrogel based flexible sensor has been considered as a promising wearable device in human-machine interactions, which is of great significance in the mobile communications, personal healthcare, and intelligent robots....
Hydrogels combining good biocompatibility and super flexibility have attracted tremendous interests in flexible sensors. Nevertheless, they always suffer from poor stability due to the dehydration property in the long period,...
Capturing human motions using wearable electronics provides
tremendous
opportunities for human–machine interfaces. However, current
flexible sensors are always challenged due to the contradiction between
the self-healing property and mechanical performance of the flexible
matrix. Moreover, the strain sensing range of current sensors is always
limited within 5% due to the ineffectiveness of conductive components
upon larger strain. Inspired by the synergistic combination of hydrogen
bondings and metal coordination, a self-healable elastomer was synthesized,
which displayed a tensile strength of 1.73 MPa and a self-healing
efficiency of 93%. Moreover, the designed flexible sensor using a
synthesized silicone elastomer substrate and a carbon nanotube conductive
component displayed a high gauge factor of 1198 contributed by the
cooperation of the wrinkle structure and the microcrack mechanism.
The flexible sensors exhibited a fast response of 129 ms due to the
excellent adhesion of the conductive layer upon the substrate. Furthermore,
a wearable intelligent gesture capturing system integrating an elastomer-based
sensor and a wireless electronic control module was successfully developed
to realize the real-time monitoring of hand gestures. Thus, the developed
silicone elastomer-based sensor holds high potential for human–machine
interfaces and provides a novel pathway for hand rehabilitation training.
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