Raman spectroscopic investigation of ion-beam-irradiated glassy carbon
- Department of Applied Physics, Royal Melbourne Institute of Technology, P. O. Box 2476V, Melbourne, Victoria 3001 (Australia)
- Department of Physics, Monash University, Clayton, Victoria 3168 (Australia)
Raman spectroscopy has been used to monitor the changes induced in glassy carbon as a result of irradiation with H, He, C, N, Si, and Xe ions. The Raman spectrum of unirradiated glassy carbon consists of an intrinsic graphite peak at 1590 cm{sup {minus}1} (the a peak) and a disorder-induced {ital D} peak at 1350 cm{sup {minus}1}. The {ital G} peak position and FWHM and the ratio of the {ital D} peak intensity to that of the {ital G} peak ({ital I}({ital D})/{ital I}({ital G})) are plotted as functions of the calculated damage density induced by the ion beam. The results show that at very low damage levels ( {lt} 0.008 displacements per atom (DPA)), considerable disorder is being introduced into the system, and the average crystallite size has been reduced from 35 A for the unirradiated material to about 25 A. At damage levels of {similar to}0.21 DPA, the material starts to undergo an ion-beam-induced modification which saturates at about 5 DPA. The Raman spectra for these heavily irradiated samples are very similar to those obtained from amorphous carbons. At yet higher doses there is some evidence suggesting that ion-beam-induced partial graphitization of the irradiated glassy carbon has occurred. The results are discussed in the context of previously reported Raman studies of amorphous carbons and highly oriented pyrolytic graphite.
- OSTI ID:
- 6380239
- Journal Information:
- Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:5; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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