Qu Mengnan, Dong Yurou, Liu Qinghua, Wang Yuqing, Feng Pu, Zhang Ying, Deng Yuan, Zhang Ruizhe, Sun Cai-Li, He Jinmei
College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
College of Energy, Xi'an University of Science and Technology, Xi'an 710054, China.
ACS Appl Mater Interfaces. 2025 Jan 8;17(1):2105-2116. doi: 10.1021/acsami.4c12571. Epub 2024 Dec 28.
Polyurethane sponge is frequently selected as a substrate material for constructing flexible compressible sensors due to its excellent resilience and compressibility. However, being highly hydrophilic and flammable, it not only narrows the range of use of the sensor but also poses a great potential threat to human safety. In this paper, a conductive flexible piezoresistive sensor (CHAP-PU) with superhydrophobicity and high flame retardancy was prepared by a simple dip-coating method using A-CNTs/HGM/ADP coatings deposited on the surface of a sponge skeleton and modified with polydimethylsiloxane. With great sensitivity and durability (>3000 cycles) as well as fast response/recovery time (152 ms/178 ms), the sensor is capable of monitoring human movement as a wearable device. The modified material surface has a hydrophobicity angle of 153°, which provides significant self-cleaning and weather resistance. Furthermore, the CHAP-PU sensor is able to respond stably to underwater movements. Importantly, when the sponge was directly exposed to an open flame, no flame spreading or dripping of molten material was detected, indicating excellent flame retardancy. Meanwhile, CHAP-PU was also equipped as a smart fire alarm system, and the results showed that an alarm signal was triggered within 2 s under flame erosion. Therefore, the flame-retardant superhydrophobic CHAP-PU sponge-based sensor shows great potential for human motion detection and fire alarm applications.
聚氨酯海绵因其出色的弹性和可压缩性，常被选作构建柔性可压缩传感器的基底材料。然而，由于其高亲水性和易燃性，它不仅缩小了传感器的使用范围，还对人类安全构成了巨大的潜在威胁。本文通过简单的浸涂法，使用沉积在海绵骨架表面并经聚二甲基硅氧烷改性的A-CNTs/HGM/ADP涂层，制备了一种具有超疏水性和高阻燃性的导电柔性压阻式传感器（CHAP-PU）。该传感器具有高灵敏度和耐久性（>3000次循环）以及快速的响应/恢复时间（152毫秒/178毫秒），能够作为可穿戴设备监测人体运动。改性材料表面的疏水角为153°，具有显著的自清洁和耐候性。此外，CHAP-PU传感器能够对水下运动做出稳定响应。重要的是，当海绵直接暴露于明火时，未检测到火焰蔓延或熔融材料滴落，表明其具有出色的阻燃性。同时，CHAP-PU还被配备为智能火灾报警系统，结果表明在火焰侵蚀下2秒内即可触发报警信号。因此，基于阻燃超疏水CHAP-PU海绵的传感器在人体运动检测和火灾报警应用中显示出巨大潜力。
