Huali Xie,Xuejun Lai,Hongqiang Li,Jiefeng Gao,Xingrong Zeng,Xiaoyi Huang,Xiaoyong Lin
Design and exploitation of flame retardant coatings with sensitive fire-warning response and self-healing capability are urgently needed to decrease the fire risk of combustible materials. Herein, we reported the fabrication of a novel multifunctional flame retardant nanocoating created by using graphene oxide (GO) and functional cellulose (FC) via one step self-assembly. The prepared nacre-like nanocoating endowed many kinds of combustible materials (including polypropylene, polyurethane foam and wood) with exceptional fire safety. All the coated substrates were self-extinguished in the flame retardant tests. More importantly, when being attacked by fire at the very early stage, it triggered the fire-warning in less than three seconds through the dramatic decrease of electrical resistance. Moreover, the nanocoating exhibited outstanding self-healing capability at room temperature. Due to the multiple hydrogen bondings between the ureido pyrimidinone groups on FC, the damaged coating could be healed successfully and almost recovered to its original integrated performance. Our work provides a new and effective route to remarkably improve the fire safety of the combustible materials, exhibiting an enticing prospect for its application in the fields of building, transportation and electrical equipment.
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）