Polymerization of solid C_(60) under C_(60)~+ cluster ion bombardment

摘要

The structure transformation occurring in fuller-ene film under bombardment by 50 keV C_(60)~+ cluster ions is reported. The Raman spectra of the irradiated C_(60) films reveal a new peak rising at 1458 cm~(-1) with an increase in the ion fluence. This feature of the Raman spectra suggests linear polymerization of solid C_(60) induced by the cluster ion impacts. The aligned C_(60) polymeric chains composing about 5-10 fullerene molecules have been distinguished on the film surface after the high-fluence irradiation using atomic force microscopy (AFM). The surface profiling analysis of the irradiated films has revealed pronounced sputtering during the treatment. The obtained results indicate that the C_(60) polymerization occurs in a deep layer situated more than 40 nm below the film surface. The deep location of the C_(60) polymeric phase indirectly confirms the dominant role of shock waves in the detected C_(60) phase transformation.