  We investigated the physicochemical surface properties of different highly
aligned nitrogen-doped multi-walled carbon nanotube (N-MWCNT) carpets,
synthesized using toluene/pyrazine, toluene/benzylamine and acetonitrile via a
sublimation-based chemical vapor deposition (SCVD) method at 760{\deg}C. The
surfaces of the N-MWCNT carpets synthesized using toluene/pyrazine and
toluene/benzylamine were very hydrophobic. In contrast, we observed a complete
wetting of the N-MWCNT carpets synthesized using acetonitrile. The difference
in the wetting behavior of these N-MWCNT carpets is the main focus in this
study and was not investigated before. Here, we show that not only the presence
or concentration of nitrogen inside the carbon lattice, but especially it's
kind of incorporation have an important influence on the surface polarity.
