Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 121, Issue 1-3, Pages 183-201Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0368-2048(01)00334-6
Keywords
diamond; CVD; surfaces; X-ray photoelectron spectroscopy; oxidation; workfunction
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X-ray photoelectron spectroscopy (XPS) for elemental and phase analysis of diamond surfaces is reviewed, including both single crystal natural diamond and polycrystalline chemical vapour deposition (CVD) films. The core Cls peaks, plasmon losses and valence band spectra Of sp(2) graphite are compared with those of sp(3) diamond, and briefly with mixed sp(2)/sp(3) hard carbon films. Surface reconstructions are reviewed for diamond in the presence of hydrogen or following thermal annealing. Attention is drawn to the destructive effects of argon ion bombardment 'cleaning'. The synthesis of CVD diamond, including the initial nucleation process, is described and the significance of hydrogen is explained. Chemical modification of the surface of diamond films is discussed, with relevance to sensors and field electron emission. XPS analysis of (111) polycrystalline films treated by atom beams of N, O, H, Cl is described and the influence of unwanted oxygen is emphasised. For both atom beam and furnace oxidation, the oxygen is incorporated into the (111) diamond surface as bridging C-O-C. (C) 2001 Elsevier Science B.V. All rights reserved.
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