Diamond nanoparticles to carbon onions transformation: X-ray diffraction studies

Satoshi Tomita, Andrzej Burian, John C. Dore, David LeBolloch, Minoru Fujii, Shinji Hayashi

Research output: Contribution to journalArticlepeer-review

187 Citations (Scopus)


Carbon onions prepared by high temperature annealing of ultradispersed diamond nanoparticles of about 5 nm in average diameter have been studied by X-ray diffraction using synchrotron radiation. The X-ray diffraction patterns show transformation of the diamond nanoparticles with sp3 bonds into spherical carbon onions containing remaining diamond-like core and then into polyhedral onions with facets on their outer part and pure sp2 graphitic bonds. The prepared onions form concentric-shell particles which comprise of about ten shells with an intershell distance of 0.35-0.36 nm. The large intershell distance suggests a considerable reduction in intershell interaction when compared to perfect graphite. The X-ray data are related to the previously performed studies by electron energy-loss spectroscopy and electron spin resonance.

Original languageEnglish
Pages (from-to)1469-1474
Number of pages6
Issue number9
Publication statusPublished - 2002 Aug


  • A. Carbon onions diamond
  • B. Annealing
  • C. X-ray diffraction
  • D. Phase transitional


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