Hubei Longzhong Laboratory, Xiangyang 441000, China.
School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science & Technology, Wuhan 430074, China.
ACS Appl Bio Mater. 2024 Oct 21;7(10):6823-6831. doi: 10.1021/acsabm.4c00966. Epub 2024 Sep 20.
Flexible and wearable pressure sensors have attracted significant attention in the fields of smart medicine and human health monitoring. Nevertheless, the design and fabrication of degradable disposable pressure sensors still face urgent challenges. Herein, we fabricated poly(3-hydroxybutyrate) (PHB)-reinforced chitosan (CS) piezoelectric films for intelligent sensors through a simple, low-cost, and environmentally friendly roll-forming method. The results show that PHB doping successfully increased the effective piezoelectric coefficient of the chitosan-based film from 40.12 to 49.38 pm/V (a 23% increase). Simultaneously, the pressure sensor based on the CS/PHB film exhibited excellent response sensitivity (484 mV/kPa) and a wide linear response range (0-130 kPa), which could be used as haptic sensors and motion monitoring sensors for the fast response to human motion signals. Additionally, the CS/PHB film could be completely degraded within 18 days in a natural soil environment, demonstrating outstanding degradability. Therefore, chitosan-based piezoelectric films with excellent biodegradability and piezoelectric characteristics have been successfully fabricated in this work, which will promote the innovative development of green chitosan-based electronic devices and disposable pressure sensors.
可拉伸和可穿戴压力传感器在智能医学和人体健康监测领域引起了极大关注。然而，可降解一次性压力传感器的设计和制造仍然面临着紧迫的挑战。在此，我们通过简单、低成本且环保的辊压成型方法，制备了用于智能传感器的聚(3-羟基丁酸酯)(PHB)增强壳聚糖(CS)压电薄膜。结果表明，PHB 的掺杂成功将基于壳聚糖的薄膜的有效压电系数从 40.12 增加到 49.38 pm/V（增加了 23%）。同时，基于 CS/PHB 薄膜的压力传感器表现出优异的响应灵敏度（484 mV/kPa）和较宽的线性响应范围（0-130 kPa），可用于触觉传感器和运动监测传感器，以快速响应人体运动信号。此外，CS/PHB 薄膜在自然土壤环境中可在 18 天内完全降解，表现出优异的可降解性。因此，本工作成功制备了具有优异生物降解性和压电特性的基于壳聚糖的压电薄膜，这将促进绿色基于壳聚糖的电子设备和一次性压力传感器的创新发展。
