Electron energy-loss spectroscopy of carbon onions

Carbon onions prepared by high-temperature annealing of nanocrystalline diamonds have been studied by electron energy-loss spectroscopy

Satoshi Tomita; Minoru Fujii; Shinji Hayashi; Keiichi Yamamoto

2002

Scholarcy highlights

  • Carbon onions prepared by high-temperature annealing of nanocrystalline diamonds have been studied by electron energy-loss spectroscopy
  • It was found that the core-loss spectrum of spherical carbon onions was very similar to that of nanocrystalline diamonds, the low-loss spectrum and the high-resolution transmission electron microscopic observation suggest the formation of graphitic sp2 network
  • The core-loss spectrum indicates that spherical onions have a number of sp3 bonds
  • A possible explanation for these sp3 bonds is that there remains a tiny residual diamond particle in a spherical onion
  • Another explanation is that the spherical carbon onion has sp3 bonds as structural defects

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