Highly conductive hydrogel sensors driven by amylose with freezing and dehydration resistances

Abstract

Conductive hydrogels are ideal materials for preparing wearable strain sensing devices due to their flexibility and stretchability. However, most hydrogels exhibited poor freezing resistance and weak water-holding ability, thus hindering...

Self-powered wearable sensing devices based on a flexible ammonium-ion battery with fatigue resistance and frost resistance based on a strong and tough hydrogel

“…Compared with the PHEA hydrogel, the PHEA/AS hydrogel showed a low freezing point (−39 °C), and the freezing point of the PHEA/AS/Gly hydrogel was further reduced to −42 °C. These mechanical, electrical, rheologic and DSC data indicate that the crosslinked networks of the PHEA/AS/Gly hydrogel restrict the growth of ice crystals, 42,43 and the addition of NH 4 + , SO 4 2− and Gly further prevents the water in the gel from freezing, 1,3,44 which endows PHEA/AS/Gly hydrogel with excellent mechanical strength and conductivity at low temperature.…”

“…Wearable sensors have been attracting more and more attention in daily life and scientific research. [1][2][3][4][5] If there is no electricity, traditional sensors needing a power supply stop working, which greatly limits their applications. [6][7][8] Self-powered wearable sensing devices containing electric energy storage systems and sensors are proposed to solve the problem.…”

Super Stretchable, Self‐Healing, Adhesive Ionic Conductive Hydrogels Based on Tailor‐Made Ionic Liquid for High‐Performance Strain Sensors

“…Figure a shows the comparison of our work to various references in terms of stretchability versus response time. [ 6,9,21,23,38,40,54–64 ] It is worth noting that our PAM/PBA‐IL3/CNF2 hydrogel sensor simultaneously exhibits higher intrinsic stretchability (up to 1810 ± 38%) and a fast response time (195 ms) than other reported ICHs. In addition, as shown in Figure 8b, compared with recently reported gel‐based strain sensors, [ 4,12,21,38,55,65,66 ] most procedures for constructing such sensors often have restricted functionalities, such as their conductivity, stretchability, gauge factor, self‐healing, adhesion, transparency, and water retention.…”

“…[ 6,9,21,23,38,40,54–64 ] It is worth noting that our PAM/PBA‐IL3/CNF2 hydrogel sensor simultaneously exhibits higher intrinsic stretchability (up to 1810 ± 38%) and a fast response time (195 ms) than other reported ICHs. In addition, as shown in Figure 8b, compared with recently reported gel‐based strain sensors, [ 4,12,21,38,55,65,66 ] most procedures for constructing such sensors often have restricted functionalities, such as their conductivity, stretchability, gauge factor, self‐healing, adhesion, transparency, and water retention. However, our hydrogel‐based sensors prepared by a facile one‐step approach clearly display excellent comprehensive merits: i) ingenious structural design and crosslinking without the use of complicated components, ii) a fine trade‐off between electrical and mechanical performance, and iii) favorable adhesion, self‐healing property, transparency, and water retention.…”

“…a) Chart compares the response time and stretchability of our work (red star) and references. [ 6,9,21,23,38,40,54–64 ] b) Comparison between our work and currently reported sensors in terms of their conductivity, stretchability, gauge factor, self‐healing, adhesion, transparency, and water retention. [ 4,12,21,38,55,65,66 ] …”