Modified π-states in ion-irradiated carbon

✍ Scribed by G. Kovach; A. Karacs; G. Radnoczi; H. Csorbai; L. Guczi; M. Veres; M. Koos; L. Papadimitriou; A. Sólyom; G. Pető

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 731 KB
• Volume: 254
• Category: Article
• ISSN: 0169-4332
• DOI: 10.1016/j.apsusc.2007.10.051

✦ Synopsis

CVD polycrystalline diamond film, pulse laser-deposited (PLD) carbon film and highly oriented pirolitical graphite (HOPG) as reference, were modified by means of Ar + ion bombardment and characterized by means of Raman scattering, transmission electron microscopy, electrondiffraction (TEM), reflected electron energy loss specroscopy (REELS) and X-ray photoelectron spectroscopy (XPS) techniques. It was found that the diamond was transferred to a carbon with halo-like morphology and disordered stack of graphene segments. Instead of the well-known electron energy loss peak of graphite at 6.5 eV, a new REELS peak appeared at 4-5 eV energies. The observed effect was explained by the modification of p-system in carbon films as a consequence of the formation of non-planar, nanometer-sized graphitic planes.