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Formation of diamond nanostructures from graphite using 10 W fibre laser

Authors
  • Verma, Assim1
  • Prakash, Bhanu1
  • Sharma, Deepika1
  • 1 Institute of Nano Science and Technology, Mohali, 160062, India , Mohali (India)
Type
Published Article
Journal
Bulletin of Materials Science
Publisher
Springer-Verlag
Publication Date
Oct 15, 2020
Volume
43
Issue
1
Identifiers
DOI: 10.1007/s12034-020-02255-8
Source
Springer Nature
Keywords
License
Yellow

Abstract

The high activation energy required for graphite–diamond transition limits its applicability in novel areas. To exploit fully the multifunctional properties of diamond in diverse fields, there is a necessity to explore more efficient ways for its synthesis. In this study, we have demonstrated a new approach for nanodiamonds formation by employing a commercially available low power 10 W continuous-wave fibre laser. The laser system is modulated to generate the high-pressure high temperature environment necessary for the phase conversion of graphite to diamond. The microsecond pulse duration combined with liquid confinement effect on plasma provide scope for a lower rate of supercooling, which restricts the epitaxial growth of the crystals. The sample is characterized by X-ray powder diffraction, transmission electron microscope and Raman spectroscopy, confirming the presence of different types of nanodiamonds including newly discovered n-diamond. The process offers many important advantages like scalable process, non-catalyst-based eco-friendly and cost-effective synthesis of metastable nanodiamonds. The results demonstrate the effectuality of inexpensive commercial lasers towards attaining the localized extreme environment necessary for direct phase conversion of diamond materials.

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