Abstract
A process was investigated to irradiate a continuous-wave CO 2 laser (4.5 kW) on graphite powder with a mean diameter of 5 μm in a flow of Ar or He gas at 30 or 200 Torr. The film produced on a Ni substrate in the Ar flow at 200 Torr showed the Raman bands of C 60 and C 70, and the C 60/C 70 ratio was estimated to be 5/1 by MALDI-TOF mass spectrometry. The film formation process is discussed on the basis of an analysis of laser-irradiated powder, which included 0.01 wt% of C 60, by UV–Vis absorption, and by observations of the plumes and SEM images.
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