The porous aligned carbon nanotube(ACNTs) films prepared by pyrolysis of me
tal phthalocyanines show an ultrahydrophobic property. The contact angle fo
r water of the films is 161 degrees. The films modified with fluoroalkylsil
ane show a better hydrophobic property. The contact angle for water of the
modified films is as high as 172 degrees, The alignment structure of the fi
lms and large fraction of air on the films are considered to be responsible
for the ultrahydrophobic property.