EEL calculations and measurements of graphite and graphitic-CNx core-losses
Core EEL spectra of MWCNTs (multi-wall carbon nanotubes) grown in a nitrogen atmosphere were acquired utilising a dedicated STEM equipped with a Gatan Enfina system. Splitting of the carbon K-edge pi* resonance into two peaks provided evidence of two non-degenerate carbon bonding states. In order to...
| Main Authors: | , , , , , |
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| Format: | Conference item |
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2006
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| Summary: | Core EEL spectra of MWCNTs (multi-wall carbon nanotubes) grown in a nitrogen atmosphere were acquired utilising a dedicated STEM equipped with a Gatan Enfina system. Splitting of the carbon K-edge pi* resonance into two peaks provided evidence of two non-degenerate carbon bonding states. In order to confirm the presence of a CNx bonding state, a full-potential linearised augmented plane-wave method was utilised to simulate core EEL spectra of graphite and graphitic-CNx. compounds. The simulations confirmed splitting of the carbon K-edge pi* resonance in graphitic-CNx materials, with the pristine graphite pi* resonance remaining unsplit. The simulations also confirmed the increasing degree of amorphicity with higher concentrations (25%) of substitutional nitrogen in graphite. |
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