Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 50, Pages 56470-56479Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c17242
Keywords
phase-transition-tunable network; antifreezing; long-lasting moisture; antibacterial activity; dual-response sensor
Funding
- State Natural Sciences Fund, China [21506236, 51372276]
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Flexible sensors based on conductive hydrogel show great potential in electronic skin and human-machine interface. However, pure water in hydrogel inevitably freezes or rapidly evaporates under extreme temperatures, leading to inadequate fulfillment of sensor performances. Herein, a well-designed strategy is reported for fabricating extreme temperature-tolerant gel-based sensors. By immersing a gelatin/polyacrylamide (PAAm)-clay composite (GC) hydrogel into a ZnCl2/water/glycerol system, a phase-transition-tunable gel (PTTGC gel) is obtained with outstanding antifreezing (-82 degrees C) and long-lasting moisture (70 degrees C, more than 40 days) properties. Meanwhile, the gel also presents good antibacterial activity and biocompatibility attributing to Zn2+ and gelatin, respectively. Then, a dual-response sensor with a wide operating temperature (-60 to 60 degrees C) is proposed, presenting high stress and temperature sensitivities and long-term stability. The sensor will meet the needs of the human-machine interface for scientific investigation and data monitoring in polar, desert, etc.
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