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Efficient Flame Detection and Early Warning Sensors on Combustible Materials Using Hierarchical Graphene Oxide/Silicone Coatings
Design
and development of smart sensors for rapid flame detection
in postcombustion and early fire warning in precombustion situations
are critically needed to improve the fire safety of combustible materials
in many applications. Herein, we describe the fabrication of hierarchical
coatings created by assembling a multilayered graphene oxide (GO)/silicone
structure onto different combustible substrate materials. The resulting
coatings exhibit distinct temperature-responsive electrical resistance
change as efficient early warning sensors for detecting abnormal high
environmental temperature, thus enabling fire prevention below the
ignition temperature of combustible materials. After encountering
a flame attack, we demonstrate extremely rapid flame detection response
in 2–3 s and excellent flame self-extinguishing retardancy
for the multilayered GO/silicone structure that can be synergistically
transformed to a multiscale graphene/nanosilica protection layer.
The hierarchical coatings developed are promising for fire prevention
and protection applications in various critical fire risk and related
perilous circumstances