Modification of polycarbonate and polypropylene surfaces by argon ion cluster beams

Impacts of energetic argon ion clusters on surfaces of inorganic solids have shown modification of the respective surface properties. Polymeric samples such as (PC) polycarbonate and (PP) polypropylene were irradiated by argon ion clusters (average size of 3000 atoms) accelerated to 10 and 20 keV at doses ranging from 109 to 1014 cluster/cm2. The irradiated surfaces were investigated by surfometer (profilometer), atomic force microscope, contact angle measurements and x-photoelectron spectroscopy. Measurements using these techniques show that the smoothing effect and the postirradiation oxidation of the surface take place. The direct evidence was obtained in case of PP that the irradiation dose 1011 cluster/cm2 produces the smoothest surface as measured by surfometer. In the case of PC the same conclusion is suggested indirectly.