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

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Presentation transcript:

EELS analysis of carbon structures Nanotube seminar Gergely Kovách MTA MFA

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

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

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(  *)

Core level absorption spectra of C samples DLC Graphite Evap. C J. Yuan, Micron 515 (2000) STEM at 100 kV sp 2 /sp 3 obtained from peak intensity

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

sp 2 /sp 3 ratio: Plasmon energy shift

sp 2 /sp 3 ratio: using reference material

sp 2 /sp 3 ratio: C1s binding energy

Own measurements

References J. Robertson, Mat. Sci. and Eng. R 37 (2002) 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)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 S. D. Berger, D. R. McKenzie, and P. J. Martin, Philos. Mag. Lett. 57, 285 (1988) [CAS][INSPEC].CASINSPEC J. Kulik et. al. Phys. Rev. B Vol. 52, No (1995) J. Yuan, L.M. Brown, Micron 31 (2000) 515 G. Kovach, H. Csorbai, G.Z. Radnoczi, et al., Mat. Sci. Forum 414-4: , 2003 Properties of high-density amorphous carbon films deposited by laser ablation Properties of high-density amorphous carbon films deposited by laser ablation S. Rey et. al. Appl. Phys. A (2000) [14] Y. Lifshitz, Diam. Rel. Mat. 8, 1659 (1999) Phys. Rev. B 48, 4777–4782 (1993) D. L. Pappas, K. L. Saenger, J. Bruley, W. Krakow and J. J. Cuomo, J. Appl. Phys. 71, 5675 (1992) [ADS][ SPIN][ INSPEC];J. Appl. Phys. 71, 5675 (1992)ADSSPININSPEC J. J. Cuomo et al., Appl. Phys. Lett. 58, 466 (1991) [ADS][CAS][ SPIN][ INSPEC].Appl. Phys. Lett. 58, 466 (1991)ADSCASSPININSPEC J. Kulik et al., J. Appl. Phys. 76, 5063 (1994) [ADS][CAS][ SPIN][INSPEC].J. Appl. Phys. 76, 5063 (1994)ADSCASSPININSPEC