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Undercooling driven growth of Q-carbon, diamond, and graphite

Published online by Cambridge University Press:  26 April 2018

Siddharth Gupta Open the ORCID record for Siddharth Gupta [Opens in a new window] ,
Ritesh Sachan Open the ORCID record for Ritesh Sachan [Opens in a new window] ,
Anagh Bhaumik ,
Punam Pant  and
Jagdish Narayan
Siddharth Gupta
Affiliation:
Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA
Ritesh Sachan
Affiliation:
Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA Materials Science Division, Army Research Office, Research Triangle Park, NC 27709, USA
Anagh Bhaumik
Affiliation:
Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA
Punam Pant
Affiliation:
Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA
Jagdish Narayan*
Affiliation:
Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA
*
Address all correspondence to Jagdish Narayan at [email protected]
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Abstract

We provide insights pertaining the dependence of undercooling in the formation of graphite, nanodiamonds, and Q-carbon nanocomposites by nanosecond laser melting of diamond-like carbon (DLC). The DLC films are melted rapidly in a super-undercooled state and subsequently quenched to room temperature. Substrates exhibiting different thermal properties—silicon and sapphire, are used to demonstrate that substrates with lower thermal conductivity trap heat flow, inducing larger undercooling, both experimentally and theoretically via finite element simulations. The increased undercooling facilitates the formation of Q-carbon. The Q-carbon is used as nucleation seeds for diamond growth via laser remelting and hot-filament chemical vapor deposition.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 2 , June 2018 , pp. 533 - 540
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Copyright
Copyright © Materials Research Society 2018 

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