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EELS analysis of carbon structures

EELS analysis of carbon structures. Gergely Kovách MTA MFA. Nanotube seminar 2005. 05. 09. Electron spectroscopy. EELS, electron energy loss is characteristical to the material XPS, binding energy of C1s (284.6eV, 285.4eV) core level electron, energy loss of core level electron.

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EELS analysis of carbon structures

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  1. EELS analysis of carbon structures Gergely Kovách MTA MFA Nanotube seminar 2005. 05. 09.

  2. Electron spectroscopy • EELS, electron energy loss is characteristical to the material • XPS, binding energy of C1s (284.6eV, 285.4eV) core level electron, energy loss of core level electron

  3. Electron energy loss in solids a – zero loss b – fonons c – band transitions d – surface plasmons e – bulk plasmons f – inner shell absorption edge

  4. Hybridization of C atoms • Energy difference in hybridized orbitals • Broadening of  bonds • Also valid for amorphous structure -Pre edge feature in C1s-2p absorption 1s-2p(*)

  5. Core level absorption spectra of C samples DLC Graphite Evap. C STEM at 100 kV sp2/sp3 obtained from peak intensity J. Yuan, Micron 515 (2000)

  6. Polarization of 1s-2pz transition Anisotropic response of 1s-2p dipole transition -> difficulties in quantitative analysis

  7. sp2/sp3 ratio:Plasmon energy shift

  8. sp2/sp3 ratio:using reference material

  9. sp2/sp3 ratio:C1s binding energy

  10. Own measurements

  11. References • J. Robertson, Mat. Sci. and Eng. R 37 (2002) 129-281 • P. J. Fallon, V. S. Veerasamy, C. A. Davis, J. Robertson, G. A. J. Amaratunga, W. I. Milne, J. Koskinen Phys. Rev. B 48, 4777–4782 (1993) Phys. Rev. B 48, 4777 (1993) • R.F.Egerton, Electron Energy-Loss Spectroscopy in the Electron Microscope (1986) • J. Bruley, L.M. Brown and S.D. Berger. Inst. Phys. Conf. Ser.78 (1985), p. 561. • S. D. Berger, D. R. McKenzie, and P. J. Martin, Philos. Mag. Lett. 57, 285 (1988) [CAS][INSPEC]. • J. Kulik et. al. Phys. Rev. B Vol. 52, No. 22. 15812 (1995) • J. Yuan, L.M. Brown, Micron 31 (2000) 515 • G. Kovach, H. Csorbai, G.Z. Radnoczi, et al., Mat. Sci. Forum 414-4: 127-132, 2003 Properties of high-density amorphous carbon films deposited by laser ablation • S. Rey et. al. Appl. Phys. A 71 433 (2000) • [14] Y. Lifshitz, Diam. Rel. Mat. 8, 1659 (1999) Phys. Rev. B 48, 4777–4782 (1993) http://prola.aps.org/abstract/PRB/v48/i7/p4777_1 • D. L. Pappas, K. L. Saenger, J. Bruley, W. Krakow and J. J. Cuomo, J. Appl. Phys. 71, 5675 (1992) [ADS][ SPIN][ INSPEC]; • J. J. Cuomo et al., Appl. Phys. Lett. 58, 466 (1991) [ADS][CAS][ SPIN][ INSPEC]. • J. Kulik et al., J. Appl. Phys. 76, 5063 (1994) [ADS][CAS][ SPIN][INSPEC].

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