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Title: Beam-induced graphitic carbon cage transformation from sumanene aggregates

We found that electron-beam irradiation of sumanene aggregates strongly enhanced their transformation into a graphitic carbon cage, having a diameter of about 20 nm. The threshold electron dose was about 32 mC/cm{sup 2} at 200 keV, but the transformation is still induced at 20 keV. The transformation sequence suggested that the cage was constructed accompanied by the dynamical movement of the transiently linked sumanene molecules in order to pile up inside the shell. Thus, bond excitation in the sumanene molecules rather than a knock-on of carbon atoms seems to be the main cause of the cage transformation.
Authors:
; ;  [1] ;  [2] ; ; ;  [3] ;  [4]
  1. Institute of Applied Physics, University of Tsukuba, Tsukuba 305-8573 (Japan)
  2. (TIMS), Tsukuba 305-8573 (Japan)
  3. Research Center of Integrative Molecular Systems, Institute for Molecular Science, Myodaiji, Okazaki 444-8787 (Japan)
  4. Transmission Electron Microscopy Station, National Institute for Materials Science, Tsukuba 305-0047 (Japan)
Publication Date:
OSTI Identifier:
22280714
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMS; ELECTRON BEAMS; ELECTRONS; EXCITATION; GRAPHITE; IRRADIATION; MOLECULES; NANOSTRUCTURES; PHASE TRANSFORMATIONS; PHYSICAL RADIATION EFFECTS; RADIATION DOSES; TRANSIENTS