Stable　and　easily　controllable　wettability　of　a　solid　surface　is　of　great　significance　in　many　applications.　In　the　present　studies,　a-C　films　with　special　nano-structured　surfaces　were　deposited　on　silicon　and　glass　substrates　with　magnetron　sputtering　method.　The　morphologies　of　the　surfaces　vary　with　the　deposition　parameters.　Therefore,　these　a-C　surfaces　can　be　controlled　to　exhibit　different　wettability　in　a　wide　range　from　the　hydrophilicity　to　the　super-hydrophobicity.　The　studies　also　prove　that　the　CF4　plasma　treatment　will　remarkably　enhance　the　hydrophobicity　of　the　a-C　films.　And　the　fluorinated　a-C　surfaces　show　an　excellent　super-hydrophobic　property　for　all　the　pH　values　of　the　aqueous　solution.　Moreover,　a　super-hydrophobic　surface　of　the　non-fluorinated　a-C　film　can　be　reversed　to　being　very　hydrophilic　by　the　plasma　treatment　of　H-2　or　N2,　while　the　fluorinated　super-hydrophobic　a-C　films　show　a　good　stability.　(C)　2008　Elsevier　B.V.　All　rights　reserved.