Bacterial Cellulose Reinforced Polyaniline Electroconductive Hydrogel with Multiple Weak H‐Bonds as Flexible and Sensitive Strain Sensor

Abstract

Hydrogel, as a promising soft material, possesses many functional advantages such as stretchability, viscoelasticity, and biocompatibility. An advanced electronic platform for strain sensor is constructed by modifying hydrogels with various doping techniques. Herein, a novel flexible conductive hydrogel is synthesized by combination of bacterial cellulose/sodium alginate/polyacrylamide with the polyaniline (BSP‐PANI) through multiple intermolecular interactions. In the obtained BSP‐PANI hydrogel system, the incorporated BC serves the function of mechanically toughening and the formation of polyaniline conducting network endows the hydrogels electrical conductivity. The assembled hydrogel strain sensor can detect electrical response under different applied strains (1–200%) and monitor human motion in real time. Therefore, it is believed that the BSP‐PANI hydrogel prepared by the feasible synergetic strategy proposed in this work has greatly diversified application in smart epidermal sensors and artificial intelligence devices.

Antibacterial and UV‐Blocking Bioelectronics Based on Transparent, Adhesive, and Strain‐Sensitive Multifunctional Hydrogel

“…When the strain was 550%, the GF was 3.1, which was superior to many reported sensors. [10,[42][43][44][45] In addition, ΔR/R 0 under different strains (10%, 20%, 50%, and 100%) was also measured, as shown in Figure 6b, the PCT hydrogels displayed reproducible and reliable responses in the five cycles which was also consistent with the calculated parabolic equation. Figure 6c illustrated the ΔR/R 0 signal and strain versus time, indicating that there was no obvious delay in signal transmitting.…”

MXene-based composite double-network multifunctional hydrogels as highly sensitive strain sensors

“…3d shows the performance comparison between this work and previous studies. [40][41][42][43][44][45] As shown in Fig. 3b, the DR/R 0 value of the hydrogel sensor increases significantly with the increasing tensile strain and decreases immediately after release, providing a fast response (0.75 s) and recovery (0.81 s) performance.…”

Composite hydrogels of bacterial cellulose and an ethylene-vinyl alcohol copolymer with tunable morphological anisotropy and mechanical properties

“…However, it has been reported that BC tends to form hydrogen bonds with other polymeric structures bearing hydrogen bonding groups, including EVOH. 43,44 It is assumed that the contribution of hydrogen bonds between EVOH and BC is relatively large under the condition of a high IPA ratio. When the ratio of the more polar solvent (water) is increased, it is expected that the hydrogen bonds between BC and EVOH decrease as it interferes with the formation of such bonds.…”