Simple Fabrication
of Silica Amino Sphere-Reinforced
Ionic Liquids/Graphene Conductive Hydrogel Sensors with Super Toughness,
Self-Healing, and Strain Sensitivity Properties
posted on 2023-08-07, 21:09authored byTing Xie, Xue Lv, Song Tian, Yuhui Xie, Aowei Lv, Ziwei Lv, Li’an Jiang, Yuanhang Zhao, Shulin Sun
Conductive
hydrogels have gained considerable interest in their
potential applications in fields such as soft robotics, electronic
devices, and wearable technology. However, their widespread use has
been limited due to the inherent brittleness of conventional hydrogels.
In response to this challenge, we have engineered a multifunctional
conductive hydrogel, characterized by dual physical cross-linking
networks, using a simple, one-pot method. Our design incorporates
acrylamide (AM), lauryl methacrylate (LMA), graphene (GN), silica
amino spheres (SiO2-NH2), and 1-hexadecyl-3-methylimidazole
chloride (ILs). Notably, the LMA, SiO2-NH2 spheres,
and AM play key roles in energy dissipation through hydrophobic association
and hydrogen bonding, serving as dynamic cross-linking points. This
structural configuration endows our resultant PAM@SiO2-NH2/(ILs-GN) hydrogels with impressive tensile strains, peaking
at an extraordinary 15,318%, along with super toughness measuring
51.4 MJ/m3 and self-healing capabilities. Moreover, the
ILs facilitate effective dispersion of graphene, leading to superior
conductivity and stable resistance changes in the hydrogel, with a
conductivity measurement of 12 mS/cm. The hydrogel also demonstrates
high sensitivity, with a gauge factor of 18.94 at a strain of 1200%.
When implemented as a strain sensor, the hydrogel capably monitors
a broad spectrum of human movements in real time, capturing both large-scale
deformation and minute, nuanced motions. The culmination of these
findings suggests the immense potential of our hydrogel sensors for
use in flexible electronic skin applications, establishing them as
promising candidates for multifunctional sensors and flexible electrodes.