1. A heat dissipation foil, comprising:a flexible substrate, having a working surface and an adhesive surface, opposite the working surface,
a molecular fan film, on the working surface of the flexible substrate, and
an adhesive, on the adhesive surface of the flexible substrate,
wherein the molecular fan film is prepared by curing or drying a fluid including an emulsion that hardens upon curing and a surfactant,
the molecular fan film is electrically insulating, and
the molecular fan film comprises highly encapsulated monolayer graphene.