Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5362834 | Applied Surface Science | 2009 | 5 Pages |
Abstract
Ion bombardment is a suitable tool to improve the physical and chemical properties of polymer surface. In this study UHMWPE samples were bombarded with 130Â keV He ions to the fluences ranging from 1Â ÃÂ 1012 to 1Â ÃÂ 1016Â cmâ2. The untreated and ion beam modified samples were investigated by photoluminescence, and ultraviolet-visible (UV-vis) spectroscopy. Remarkable decrease in integrated luminescence intensity with increasing ion fluences was observed. The reduction in PL intensity with increase of ion fluence might be attributed to degradation of polymer surface and formation of defects. The effect of ion fluence on the optical properties of the bombarded surfaces was characterized. The values of the optical band gap Eg, and activation energy Ea were determined from the optical absorption. The width of the tail of the localized states in the band gap (Ea) was evaluated using the Urbach edge method. With increasing ion fluences a decrease in both the energy gap and the activation energy were observed. Increase in the numbers of carbon atoms (N) in a formed cluster with increasing the He ion fluence was observed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
A.M. Abdul-Kader,