The　serious　fire　accidents　happen　frequently　every　year　worldwide,　which　kill　many　lives　and　result　in　a　significant　property　loss.　The　sensitive　fire　alarm　systems　(FASs)　that　can　timely　detect　the　early　fire　and　immediately　give　the　alarm　are　therefore　urgently　needed.　The　traditional　FASs　based　on　smoke　and　infrared　heat　detectors　suffer　from　sluggish　fire　warning　and　susceptibility　to　external　interference.　How　to　make　a　sensitive　and　reliable　FAS　remains　a　big　challenge.　As　such,　a　new-style　FAS　based　on　graphene　oxide　came　into　being　in　2018.　The　fire　response　time　could　be　as　short　as　©　2022