Sheet structure incorporating graphitic material, and method of manufacture

A multi-layer structure comprising:

• a core layer having a core density between 0.01 and 1 g/cm3;
• and
• a skin layer covering the core layer, the skin layer having at least 10% by weight of a graphitic material, the graphitic material having one or more of graphene oxide, reduced graphene oxide, graphene, graphite oxide, reduced graphite oxide and graphite, the skin layer having a skin density of between 0.5 and 2 g/cm3, a thickness ratio of the skin layer to the core layer being of between 1:1000 and 1:1;
• comprising at least two skin layers superposed over one another, each one of the skin layers having an in-plane graphene orientation, the in-plane orientation being different for the two skin layers.

A multi-layer structure comprising:

• a core layer having a core thickness between 30 microns and 5 cm and a core density between 0.01 and 1 g/cm3;
• and
• at least two skin layers superposed over one another, each one of the skin layers having an in- plane graphene orientation, the at least two skin layers covering the core layer, each of the skin layers having a skin thickness between 3 microns and 500 microns and at least 10% by weight of a graphitic material, the graphitic material having one or more of graphene oxide, reduced graphene oxide, graphene, graphite oxide, and reduced graphite oxide, each of the skin layers having a skin density of between 0.5 and 2 g/cm3, a thickness ratio of the at least two skin layers to the core layer being of between 1:1000 and 1:1
• wherein the multi-layer structure has an average density of from 0.1186 g/cm3 to 0.3475 g/cm3.