Graphene-ceramic metamaterial shows promise in sensors and heat shields

A new lightweight, flame-resistant and super-elastic metamaterial combines high strength with electrical conductivity and thermal insulation for applications ranging from heat shields to sensors.

Developed at Purdue University, the composite combines nanolayers of aluminium oxide with graphene, both of which are brittle. This attribute is countered by the metamaterial’s honeycomb microstructure, which provides super-elasticity and structural integrity.

Graphene would ordinarily degrade when exposed to high temperature, but the ceramic aluminium oxide imparts high heat tolerance and flame-resistance, properties that might be useful as a heat shield for aircraft.

The lightweight, high-strength and shock-absorbing properties could make the composite a good substrate material for flexible electronic devices and large strain sensors.

Because it has high electrical conductivity and yet is an excellent thermal insulator, it might be used as a flame-retardant, thermally insulating coating, as well as for sensors and devices that convert heat into electricity, said Gary Cheng, an associate professor in the School of Industrial Engineering at Purdue University.