▎ 摘　　要

NOVELTY - Preparation of graphene oxide/poly(2-(dimethylamino)ethyl methacrylate)/hexagonal boron nitride sandwich layered nano-coating flame retardant cotton fabric comprises soaking cotton fabric into graphene oxide aqueous dispersion, soaking into 2-(dimethylamino)ethyl methacrylate solution, UV light illuminating, soaking into hexagonal boron nitride nano-sheet dispersion liquid, and sonicating. USE - The method is used for preparation of graphene oxide/poly(2-(dimethylamino)ethyl methacrylate)/hexagonal boron nitride sandwich layered nano-coating flame retardant cotton fabric. ADVANTAGE - The method enables to prepare flame-retardant coated cotton fabric based on graphene oxide in short time. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the fire early warning device comprising alarm lamp, low-voltage direct current power supply and graphene oxide/poly(2-(dimethylamino)ethyl methacrylate)/hexagonal boron nitride sandwich layered nano-coating flame retardant cotton fabric; and (2) preparation of large area fire early warning sensor comprising soaking graphene oxide coating cotton fabric into (2-(dimethylamino)ethyl methacrylate) solution; using mask to the conductive ink parallel coating the graphene oxide/(2-(dimethylamino)ethyl methacrylate) coating cotton fabric surface with a certain distance; removing mask, UV light illuminating and soaking in hexagonal boron nitride solution; and using lead to connect the alarm lamp, low-voltage direct current power supply and fabric in turn to form a loop.