Wettability of carbon nanofiber layers on nickel foils

► CNF layers grown on nickel foils. ► Layer thickness has bigger effect on wettability than surface roughness and porosity. ► When CNF layer is thicker than ca. 20 μm, the surface is hydrophobic. ► When the CNF layer is thinner than ca. 20 μm, the surface is hydrophilic.