▎ 摘　　要

In this work, three-dimensional graphene foams (GFs) are synthesized and characterized by scanning electron microscope (SEM) and Raman spectroscopy. The SEM images indicate that after the growth of graphene, the graphene covers the surface of nickel (Ni) foam uniformly. Raman spectra show that the percentages of monolayer, bilayer, trilayer, and multilayer graphenes are similar to 58%, similar to 32%, similar to 8%, and similar to 2%, respectively. The contact angle (CA) (similar to 12 degrees) of water droplet (3 mu L) on GF is found to be larger than that on Ni foam (similar to 107 degrees), indicating that graphenes have changed the surface wettability of the Ni foam. Meanwhile, the dynamic characteristics of CA of water droplet on GF are different from those on Ni foam. The mechanisms for different behaviors are discussed, which are attributed to volatilization and seepage of water droplets.