Anti-freezing and antibacterial conductive organohydrogel co-reinforced by 1D silk nanofibers and 2D graphitic carbon nitride nanosheets as flexible sensor
| Autor: | Junting Gao, Shuxiang Bao, Wangyang Lu, Tiefeng Xu, Wenxing Chen, Nan Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Toughness
Materials science General Chemical Engineering Graphitic carbon nitride 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Polyvinyl alcohol Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound SILK chemistry Nanofiber Ultimate tensile strength Self-healing hydrogels Environmental Chemistry Composite material 0210 nano-technology Ethylene glycol |
| Zdroj: | Chemical Engineering Journal. 411:128470 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2021.128470 |
| Popis: | Due to their excellent flexibility and high sensitivity, conductive hydrogel flexible sensors have got more and more attention in the wearable electronic devices field. However, for conductive hydrogel flexible sensors, the integration of conductive hydrogels key features (strength, stretchability, anti-freezing, antibacterial properties and large linear sensing range) is very necessary for their practical application. In this work, we creatively used soft 1D silk nanofibers (SNFs) and hard 2D graphitic carbon nitride (g-C3N4) nanosheets to co-reinforce polyvinyl alcohol (PVA) organohydrogel. Surprisingly, the addition of only 0.1% silk nanofibers and little g-C3N4 nanosheets greatly improved the tensile strength (~3.2 times) and toughness (~7.7 times) of organohydrogel. By using a binary solvent system composed of water and ethylene glycol, the organohydrogel had anti-freezing function. Even at −18 °C, it could well maintain the flexibility and conductivity of the organohydrogel. Due to the addition of Al3+, the bactericidal rate of conductive polyvinyl alcohol - silk nanofibers - graphitic carbon nitride nanosheets (PVA/SNF/CN) organohydrogel against E. coli and S. aureus was 99.527% and 99.41%, respectively. A sandwich-like flexible strain sensor based on PVA/SNF/CN organohydrogel had a large linear sensing range (0%–100%), fast response (276 ms) and superb antifatigue property (1000 cycles). It could not only successfully detect human motions (wrist bending, knee joint bending) and facial expression (smiling and frowning), but also still maintain the accuracy of the output signal for up to 20 days of use. The PVA/SNF/CN organohydrogel has shown enormous potential in flexible sensors. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect