Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5370030 | Applied Surface Science | 2006 | 5 Pages |
Improved sample wettability was obtained by oxygen plasma functionalization of pyrolytic graphite. The samples were exposed to highly dissociated oxygen plasma with the density of 1 Ã 1016 mâ3, the electron temperature of about 5.5 eV and the density of neutral oxygen atoms of 8 Ã 1021 mâ3 for 20 s. The surface wettability was measured by a contact angle of water drop. The contact angle dropped from original 112° down to about 1°. The functional groups were detected by XPS analyses. The survey spectrum showed a substantial increase of oxygen concentration on the surface, while high-resolution analyses showed additional oxygen was bonded onto the graphite surface in the form of C-O polar functional group responsible for the increase of the surface energy.