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Realization of diamond nucleation within the multi-walled carbon nanotubes matrix upon electron irradiation

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(4), pp.1119-1130
  • DOI : 10.1007/s42823-022-00346-6
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 31, 2022
  • Accepted : April 11, 2022
  • Published : June 1, 2022

Reddy Surakanti Srinivas 1 Shukla Balmukund 2 Srihari V. 3 Bhalerao G. M. 1 Shekar N. V. Chandra 4

1UGC-DAE Consortium for Scientific Research, Kalpakkam Node, Kokilamedu
2Condensed Matter Physics Division, Materials Science Group, IGCAR, HBNI, Kalpakkam, 603102, India
3High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre
4Condensed Matter Physics Division, Materials Science Group, IGCAR, HBNI, Kalpakkam

Accredited

ABSTRACT

Individual multi-walled carbon nanotubes (MWCNTs) were exposed to the electron beam of 200 kV energy and high resolution transmission electron micrographs were recorded at several time intervals. Interestingly, the nucleation of diamond nanoparticles with in the highly disordered MWCNT matrix upon electron-irradiation is observed. This happens without any assistance of high pressures and temperatures. High pressure X-ray diffraction experiments were performed on core/shell structures which suggest that even the closed structures of carbon resist any inward pressure, thereby ruling out the possibility of a hypothetical internal pressure under the electron irradiation conditions. Our experiments suggest that the transformation of graphitic carbon into diamond in the size window of a few nanometers is possible due to the stability of the diamond and a selective dissolution effect of 200 kV electrons on graphite. A mechanism for the same is proposed.

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