Thermally-induced Cyclic Resistance Transition of Transparent and Flame-retardant Layered Oxidized MXene Composite Nanocoating for Remote-sync Fire Monitoring

Abstract

Fire safety of flammable materials in building and wooden house is a critical global challenge since they are easily ignited and begin to spread rapidly in several seconds, thus escalating into serious fire disasters. Therefore, it is an urgent need to create efficient strategies and solutions to tackle fire hazards before fire becomes uncontrollable. Herein, we report a transparent and flame-retardant layered oxidized MXene (OM20) and aramid nanofibers (ANFs) composite nanocoating to construct a smart fire-warning device (FWD) for remote-sync fire prevention in buildings. Novel lamellar OM was precisely synthesized to fabricate hybrid OM20/ANFs/BA (OMAB) nanocoating. Such nanocoating not only endows the flammable polymer foam and wooden materials with outstanding flame retardancy (e.g. UL94-V0 and LOI of 34.6% for the coated woods), but provides a sensitive and cyclic fire warning response in 1.5 s for >60 cycles. The formation of compact layered C/N/B doped titanium oxide network and its heat-induced resistance transition under flame are demonstrated. Consequently, the FWD system via integrating the OMAB coating with both wireless transmission hardware and homemade visualization software provides a real-time and remote-sync fire monitoring response, which are promising to mitigate or even avoid the critical fire disaster in building or wooden house.