Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 29, Pages 34942-34953Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08421
Keywords
hydrogel; double network; toughness; conductivity; polyaniline; chitosan; polyacrylamide
Funding
- National Science Foundation of China [11572316]
- Fundamental Research Funds for the Central Universities [WK2480000006, WK2090050040]
- Science Project of Anhui Province in China [201903a07020019]
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This study successfully synthesized a type of conductive hydrogels with a double network structure, exhibiting excellent mechanical performance, conductivity, and freezing tolerance, suitable for flexible electronic sensors and showing outstanding performance at -20 degrees Celsius.
Hydrogel-based electronics have received growing attention because of their great flexibility and stretchability. However, the fabrication of conductive hydrogels with high stretchability, excellent toughness, outstanding sensitivity, and low-temperature stability still remains a great challenge. In this study, a type of conductive hydrogels consisting of a double network (DN) structure is synthesized. The dynamically cross-linked chitosan (CS) and the flexible polyacrylamide network doped with polyaniline constitute the DN through the hydrogen bonds between the hydroxyl, amide, and aniline groups. This type of hydrogels displays excellent mechanical performance, striking conductivity, and remarkable freezing tolerance. The flexible electronic sensors based on the double-network hydrogels demonstrate superior strain sensitivity and linear response on various deformations. Additionally, the good antifreezing property of the hydrogels allows the sensors to exhibit excellent performance at -20 degrees C.
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