Bonding configurations in amorphous carbon and nitrogenated carbon films synthesised by femtosecond laser deposition |
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| Authors: | SS Roy P Papakonstantinou R McCann J McLaughlin A Klini N Papadogiannis |
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| Institution: | 1. NIBEC, School of Electrical and Mechanical Engineering, University of Ulster at Jordanstown, Newtownabbey, Co. Antrim BT37 OQB, ??
2. FORTH, IESL, P.O. Box 1527, Gr711 10, Crete, Greece
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| Abstract: | The effect of nitrogen addition and laser fluence on the atomic structure of amorphous carbon films (a-C) synthesized by femtosecond pulsed laser deposition has been studied. The chemical bonding in the films was investigated by means of X-ray photoelectron (XPS) and Raman spectroscopies. XPS studies revealed a decrease in the sp3 bonded carbon sites and an associated increase in the N-sp2C bonding sites with increasing nitrogen content in the CNx films. An increase in laser fluence from 0.36 to 1.7 J/cm2 led to a rise in sp3C sites. These results were further confirmed by Raman spectroscopy. The ID/IG ratio increased monotonically and G line-width decreased with the increase of nitrogen content in the films indicating a rise in either the number or the size of the sp2 clusters. Furthermore a visible excitation wavelength dependence study established the resonant Raman process in a-C and CNx films. PACS 81.05.Uw; 81.15.Fg; 82.80 |
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