Junxiu Piao,Tianyi Li,Xu Han,Xiaoran Yang,Linze Jin,Zongyao Zhang,Yujie Ping,Sheng Bi
Ti3C2Tx MXene/polymer composites demonstrate a massive potential for multifunctional application in various fields, particularly fire safety enhancement. Unfortunately, designing MXene/polymer composites with a balanced combination of mechanical robustness, high-temperature resistance, high flame responsivity, rapid-fire response, and ultralong alarm duration remains challenging. Here, a bio-inspired, cross-scale, hierarchical design was employed to fabricate an intelligent MXene-based nanocoating (PMS) through the evaporation-induced self-assembly of molecular polyvinyl alcohol, nanometer polydopamine coated silica, and nanometer to micron MXene. This design leverages a bioinspired interaction network, which enhances both strength and toughness, improving the tensile strength and Young's modulus by 210% and 72%, respectively, compared to unoptimized systems. Furthermore, the incorporation of ceramic fusion-assisted carbonization within the MXene-based bionic network endows PMS with exceptional flame retardancy (VTM-0), high flame responsiveness (> 105), ultrafast fire alarm response (~ 0.85 s), and ultralong alarm duration time (> 2930 s). These attributes position PMS as an advanced FAS material with intrinsic fire safety and active fire-fighting performance. This work provides an innovative strategy for designing MXene-based smart materials and advancing high-performance fire warning technologies.
Although traditional fire detectors are widely used in many occasions, they still show some limitations, such as slow fire response and poor resistance to severe conditions. Thus, it is urgent to design and exploit early fire-warning device with ultrafast response and flame-retardant ability to provide timely and fast alarm. Herein, graphene oxide paper functionalized with phosphoric acid (GO-PA) is fabricated by a facile and environmentally friendly water evaporation-induced self-assembly approach. Based on the flame-induced electrical resistance transformation characteristic of GO-PA, a fire-warning detector is designed to reliably monitor early fire. Fire alarm can be triggered within 0.5 s when GO-PA samples are attacked by fire. The GO-PA composite paper is more sensitive than GO-based fire sensors reported in the literature. Phosphorus atoms are in situ doped into graphene structure during flame exposure. Combustion reaction of GO is significantly retarded by the incorporated PA , thus fire duration time of GO is greatly improved. This work paves a new way to improve fire detection performance of GO-based sensors. This work provides a guide for the development of advanced fire detection and early-warning sensors to provide reliable and continuous alarm signals.
危险品化学品经营许可证（带存储）