Is graphene hydrophobic or hydrophilic?

Air humidity can affect graphene's performance through changes in its mechanical and electrical properties - it is therefore critically important to obtain knowledge of graphene's water affinity. the findings indicate that graphene's hydrophobicity is strongly thickness-dependent; single-layer graphene being significantly more hydrophilic than its thicker counterparts.

Published in the American Chemical Society journal ACS Nano

Source: http://www.npl.co.uk/news/is-graphene-hydrophobic-or-hydrophilic