Biomimetic, Mechanically Strong Supramolecular Nanosystem Enabling Solvent Resistance, Reliable Fire Protection and Ultralong Fire Warning

A graphene oxide (GO)-based smart fire alarm sensor (FAS) has gained rapidly increasing research interest in fire safety fields recently. However, it still remains a huge challenge to obtain desirable GO-based FAS materials with integrated performances of mechanical flexibility/robustness, harsh environment-tolerance, high-temperature resistance, and reliable fire warning and protection. In this work, based on bionic design, the supermolecule melamine diborate (M center dot 2B) was combined with GO nanosheets to form supramolecular cross-linking nanosystems, and the corresponding GO-M center dot 2B (GO/MB) hybrid papers with a nacre-like micro/nano structure were successfully fabricated via a gel-dry method. The optimized GO/MB paper exhibits enhanced mechanical properties, e.g., tensile strength and toughness up to similar to 122 MPa and similar to 1.72 MJ/m3, respectively, which is similar to 3.5 and similar to 6.6 times higher than those of the GO paper. Besides, it also shows excellent structural stability even under acid/alkaline solution immersion and water bath ultrasonication conditions. Furthermore, due to the presence of promoting reduction effect and atom doping reactions in GO network, the resulting GO/MB network displays exceptional high-temperature resistance, sensitive fire alarm response (similar to 0.72 s), and ultralong alarming time (>1200 s), showing promising fire safety and protection application prospects as desirable FAS and fire shielding material with excellent comprehensive performances. Therefore, this work provides inspiration for the design and fabrication of high -performance GO-based smart materials that combine fire shielding and alarm functions.

Automated summary

This study successfully fabricated hybrid paper based on graphene oxide and supramolecular cross-linking nanosystems, which exhibited excellent mechanical properties, structural stability, high-temperature resistance, and sensitive fire alarm response. These characteristics make it an ideal material for fire alarm and fire shielding applications.