 Such films are under development for thin-film heaters, such as for defrosting windows or sidewalks.Carbon nanotubes forests and foams can also be coated with a variety of different materials to change their functionality and performance.Examples include silicon coated CNTs to create flexible energy-dense batteries, graphene coatings to create highly elastic aerogels and silicon carbide coatings to create a strong structural material for robust high-aspect-ratio 3D-micro architectures.