The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Longgang Institute of Zhejiang Sci-Tech University, Printing Industry Innovation Service Complex, Century Avenue, Longgang 325802, China.
ACS Appl Mater Interfaces. 2023 Apr 12;15(14):18262-18271. doi: 10.1021/acsami.2c21663. Epub 2023 Apr 1.
A flexible wearable temperature sensor is a novel electronic sensor that can monitor real-time changes in human body temperature in a variety of application scenarios and is regarded as the "crown jewel" of information collection technology. Although flexible strain sensors based on hydrogels have excellent self-healing effects and mechanical durability, their widespread application is still limited by external power sources. Herein, a novel self-energizing hydrogel was developed by embellishing cellulose nanocrystals (CNC) with poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The resultant thermoelectrically conductive CNC was then employed as a booster for poly(vinyl alcohol) (PVA)/borax hydrogels. The obtained hydrogels exhibit remarkable self-healing performance (92.57%) and exceptional stretchability (989.60%). Additionally, the hydrogel was capable of accurately and reliably identifying human motion. Most importantly, it exhibits excellent thermoelectric performance, capable of generating stable and reproducible voltages. It shows a large Seebeck coefficient of 1.31 mV k at ambient temperatures. When subjected to a temperature difference of 25 K, the output voltage reaches 31.72 mV. CNC-PEDOT:PSS/PVA conductive hydrogel is multifunctional with self-healing, self-powering, and temperature sensing, which has the potential to be used for the preparation of intelligent wearable temperature-sensing devices.
一种灵活的可穿戴温度传感器是一种新型电子传感器，可以在各种应用场景中监测人体体温的实时变化，被视为信息采集技术的“皇冠上的明珠”。尽管基于水凝胶的柔性应变传感器具有出色的自修复效果和机械耐久性，但它们的广泛应用仍受到外部电源的限制。在此，通过用聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）修饰纤维素纳米晶体（CNC），开发了一种新型自供电水凝胶。然后将所得的热电导 CNC 用作聚乙烯醇（PVA）/硼砂水凝胶的增强剂。所得到的水凝胶表现出显著的自修复性能（92.57%）和出色的拉伸性（989.60%）。此外，水凝胶能够准确可靠地识别人体运动。最重要的是，它表现出优异的热电性能，能够产生稳定且可重复的电压。它在环境温度下表现出 1.31 mV k 的大塞贝克系数。当施加 25 K 的温差时，输出电压达到 31.72 mV。CNC-PEDOT：PSS/PVA 导电水凝胶具有自修复、自供电和温度传感的多功能性，有望用于制备智能可穿戴温度传感设备。
