Graphene oxide/chitosan nano‐coating with ultrafast fire‐alarm response and flame‐retardant property

Abstract Using layer‐by‐layer self‐assembly technology, an intelligent nano‐coating was constructed on melamine foam (MF) by electrostatic interactions between chitosan (CS) molecules and graphene oxide (GO) nano‐sheets. According to the principle that GO is quickly reduced to reduced GO under high temperature, a fast fire‐warning network can be constructed. Due to the protective effect of nano‐coating constructed on MF, the thermal stability and flame retardancy of melamine composite foams are improved. As the nano‐coating self‐assembly layer increases to 20, its flame‐response time is only 3 s, and the continuous alarm time is as high as 1280 s. These indicate that the prepared GO‐CS composite foam possesses excellent flame retardancy and super‐fast fire response. This study provides a novel idea for the application of bio‐based nano‐coating in the fire early response and warning.